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859 lines
21 KiB
Markdown
859 lines
21 KiB
Markdown
---
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slug: /en/sql-reference/functions/tuple-functions
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sidebar_position: 180
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sidebar_label: Tuples
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---
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## tuple
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A function that allows grouping multiple columns.
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For columns with the types T1, T2, …, it returns a Tuple(T1, T2, …) type tuple containing these columns. There is no cost to execute the function.
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Tuples are normally used as intermediate values for an argument of IN operators, or for creating a list of formal parameters of lambda functions. Tuples can’t be written to a table.
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The function implements the operator `(x, y, …)`.
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**Syntax**
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``` sql
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tuple(x, y, …)
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```
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## tupleElement
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A function that allows getting a column from a tuple.
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If the second argument is a number `index`, it is the column index, starting from 1. If the second argument is a string `name`, it represents the name of the element. Besides, we can provide the third optional argument, such that when index out of bounds or no element exist for the name, the default value returned instead of throwing an exception. The second and third arguments, if provided, must be constants. There is no cost to execute the function.
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The function implements operators `x.index` and `x.name`.
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**Syntax**
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``` sql
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tupleElement(tuple, index, [, default_value])
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tupleElement(tuple, name, [, default_value])
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```
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## untuple
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Performs syntactic substitution of [tuple](../../sql-reference/data-types/tuple.md#tuplet1-t2) elements in the call location.
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The names of the result columns are implementation-specific and subject to change. Do not assume specific column names after `untuple`.
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**Syntax**
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``` sql
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untuple(x)
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```
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You can use the `EXCEPT` expression to skip columns as a result of the query.
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**Arguments**
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- `x` — A `tuple` function, column, or tuple of elements. [Tuple](../../sql-reference/data-types/tuple.md).
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**Returned value**
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- None.
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**Examples**
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Input table:
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``` text
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┌─key─┬─v1─┬─v2─┬─v3─┬─v4─┬─v5─┬─v6────────┐
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│ 1 │ 10 │ 20 │ 40 │ 30 │ 15 │ (33,'ab') │
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│ 2 │ 25 │ 65 │ 70 │ 40 │ 6 │ (44,'cd') │
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│ 3 │ 57 │ 30 │ 20 │ 10 │ 5 │ (55,'ef') │
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│ 4 │ 55 │ 12 │ 7 │ 80 │ 90 │ (66,'gh') │
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│ 5 │ 30 │ 50 │ 70 │ 25 │ 55 │ (77,'kl') │
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└─────┴────┴────┴────┴────┴────┴───────────┘
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```
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Example of using a `Tuple`-type column as the `untuple` function parameter:
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Query:
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``` sql
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SELECT untuple(v6) FROM kv;
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```
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Result:
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``` text
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┌─_ut_1─┬─_ut_2─┐
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│ 33 │ ab │
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│ 44 │ cd │
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│ 55 │ ef │
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│ 66 │ gh │
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│ 77 │ kl │
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└───────┴───────┘
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```
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Example of using an `EXCEPT` expression:
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Query:
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``` sql
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SELECT untuple((* EXCEPT (v2, v3),)) FROM kv;
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```
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Result:
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``` text
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┌─key─┬─v1─┬─v4─┬─v5─┬─v6────────┐
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│ 1 │ 10 │ 30 │ 15 │ (33,'ab') │
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│ 2 │ 25 │ 40 │ 6 │ (44,'cd') │
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│ 3 │ 57 │ 10 │ 5 │ (55,'ef') │
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│ 4 │ 55 │ 80 │ 90 │ (66,'gh') │
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│ 5 │ 30 │ 25 │ 55 │ (77,'kl') │
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└─────┴────┴────┴────┴───────────┘
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```
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**See Also**
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- [Tuple](../../sql-reference/data-types/tuple.md)
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## tupleHammingDistance
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Returns the [Hamming Distance](https://en.wikipedia.org/wiki/Hamming_distance) between two tuples of the same size.
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**Syntax**
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``` sql
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tupleHammingDistance(tuple1, tuple2)
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```
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**Arguments**
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- `tuple1` — First tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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- `tuple2` — Second tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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Tuples should have the same type of the elements.
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**Returned value**
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- The Hamming distance.
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Type: The result type is calculated the same way it is for [Arithmetic functions](../../sql-reference/functions/arithmetic-functions.md), based on the number of elements in the input tuples.
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``` sql
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SELECT
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toTypeName(tupleHammingDistance(tuple(0), tuple(0))) AS t1,
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toTypeName(tupleHammingDistance((0, 0), (0, 0))) AS t2,
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toTypeName(tupleHammingDistance((0, 0, 0), (0, 0, 0))) AS t3,
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toTypeName(tupleHammingDistance((0, 0, 0, 0), (0, 0, 0, 0))) AS t4,
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toTypeName(tupleHammingDistance((0, 0, 0, 0, 0), (0, 0, 0, 0, 0))) AS t5
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```
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``` text
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┌─t1────┬─t2─────┬─t3─────┬─t4─────┬─t5─────┐
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│ UInt8 │ UInt16 │ UInt32 │ UInt64 │ UInt64 │
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└───────┴────────┴────────┴────────┴────────┘
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```
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**Examples**
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Query:
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``` sql
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SELECT tupleHammingDistance((1, 2, 3), (3, 2, 1)) AS HammingDistance;
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```
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Result:
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``` text
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┌─HammingDistance─┐
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│ 2 │
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└─────────────────┘
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```
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Can be used with [MinHash](../../sql-reference/functions/hash-functions.md#ngramminhash) functions for detection of semi-duplicate strings:
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``` sql
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SELECT tupleHammingDistance(wordShingleMinHash(string), wordShingleMinHashCaseInsensitive(string)) AS HammingDistance
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FROM (SELECT 'ClickHouse is a column-oriented database management system for online analytical processing of queries.' AS string);
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```
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Result:
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``` text
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┌─HammingDistance─┐
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│ 2 │
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└─────────────────┘
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```
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## tupleToNameValuePairs
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Turns a named tuple into an array of (name, value) pairs. For a `Tuple(a T, b T, ..., c T)` returns `Array(Tuple(String, T), ...)`
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in which the `Strings` represents the named fields of the tuple and `T` are the values associated with those names. All values in the tuple should be of the same type.
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**Syntax**
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``` sql
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tupleToNameValuePairs(tuple)
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```
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**Arguments**
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- `tuple` — Named tuple. [Tuple](../../sql-reference/data-types/tuple.md) with any types of values.
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**Returned value**
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- An array with (name, value) pairs.
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Type: [Array](../../sql-reference/data-types/array.md)([Tuple](../../sql-reference/data-types/tuple.md)([String](../../sql-reference/data-types/string.md), ...)).
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**Example**
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Query:
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``` sql
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CREATE TABLE tupletest (col Tuple(user_ID UInt64, session_ID UInt64)) ENGINE = Memory;
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INSERT INTO tupletest VALUES (tuple( 100, 2502)), (tuple(1,100));
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SELECT tupleToNameValuePairs(col) FROM tupletest;
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```
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Result:
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``` text
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┌─tupleToNameValuePairs(col)────────────┐
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│ [('user_ID',100),('session_ID',2502)] │
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│ [('user_ID',1),('session_ID',100)] │
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└───────────────────────────────────────┘
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```
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It is possible to transform columns to rows using this function:
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``` sql
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CREATE TABLE tupletest (col Tuple(CPU Float64, Memory Float64, Disk Float64)) ENGINE = Memory;
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INSERT INTO tupletest VALUES(tuple(3.3, 5.5, 6.6));
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SELECT arrayJoin(tupleToNameValuePairs(col)) FROM tupletest;
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```
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Result:
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``` text
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┌─arrayJoin(tupleToNameValuePairs(col))─┐
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│ ('CPU',3.3) │
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│ ('Memory',5.5) │
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│ ('Disk',6.6) │
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└───────────────────────────────────────┘
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```
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If you pass a simple tuple to the function, ClickHouse uses the indexes of the values as their names:
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``` sql
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SELECT tupleToNameValuePairs(tuple(3, 2, 1));
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```
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Result:
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``` text
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┌─tupleToNameValuePairs(tuple(3, 2, 1))─┐
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│ [('1',3),('2',2),('3',1)] │
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└───────────────────────────────────────┘
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```
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## tuplePlus
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Calculates the sum of corresponding values of two tuples of the same size.
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**Syntax**
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```sql
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tuplePlus(tuple1, tuple2)
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```
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Alias: `vectorSum`.
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**Arguments**
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- `tuple1` — First tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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- `tuple2` — Second tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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**Returned value**
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- Tuple with the sum.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tuplePlus((1, 2), (2, 3));
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```
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Result:
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```text
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┌─tuplePlus((1, 2), (2, 3))─┐
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│ (3,5) │
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└───────────────────────────┘
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```
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## tupleMinus
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Calculates the subtraction of corresponding values of two tuples of the same size.
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**Syntax**
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```sql
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tupleMinus(tuple1, tuple2)
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```
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Alias: `vectorDifference`.
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**Arguments**
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- `tuple1` — First tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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- `tuple2` — Second tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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**Returned value**
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- Tuple with the result of subtraction.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tupleMinus((1, 2), (2, 3));
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```
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Result:
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```text
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┌─tupleMinus((1, 2), (2, 3))─┐
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│ (-1,-1) │
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└────────────────────────────┘
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```
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## tupleMultiply
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Calculates the multiplication of corresponding values of two tuples of the same size.
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**Syntax**
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```sql
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tupleMultiply(tuple1, tuple2)
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```
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**Arguments**
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- `tuple1` — First tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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- `tuple2` — Second tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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**Returned value**
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- Tuple with the multiplication.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tupleMultiply((1, 2), (2, 3));
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```
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Result:
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```text
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┌─tupleMultiply((1, 2), (2, 3))─┐
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│ (2,6) │
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└───────────────────────────────┘
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```
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## tupleDivide
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Calculates the division of corresponding values of two tuples of the same size. Note that division by zero will return `inf`.
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**Syntax**
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```sql
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tupleDivide(tuple1, tuple2)
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```
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**Arguments**
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- `tuple1` — First tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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- `tuple2` — Second tuple. [Tuple](../../sql-reference/data-types/tuple.md).
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**Returned value**
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- Tuple with the result of division.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tupleDivide((1, 2), (2, 3));
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```
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Result:
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```text
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┌─tupleDivide((1, 2), (2, 3))─┐
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│ (0.5,0.6666666666666666) │
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└─────────────────────────────┘
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```
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## tupleNegate
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Calculates the negation of the tuple values.
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**Syntax**
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```sql
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tupleNegate(tuple)
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```
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**Arguments**
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- `tuple` — [Tuple](../../sql-reference/data-types/tuple.md).
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**Returned value**
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- Tuple with the result of negation.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tupleNegate((1, 2));
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```
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Result:
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```text
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┌─tupleNegate((1, 2))─┐
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│ (-1,-2) │
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└─────────────────────┘
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```
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## tupleMultiplyByNumber
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Returns a tuple with all values multiplied by a number.
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**Syntax**
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```sql
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tupleMultiplyByNumber(tuple, number)
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```
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**Arguments**
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- `tuple` — [Tuple](../../sql-reference/data-types/tuple.md).
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- `number` — Multiplier. [Int/UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md) or [Decimal](../../sql-reference/data-types/decimal.md).
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**Returned value**
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- Tuple with multiplied values.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tupleMultiplyByNumber((1, 2), -2.1);
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```
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Result:
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```text
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┌─tupleMultiplyByNumber((1, 2), -2.1)─┐
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│ (-2.1,-4.2) │
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└─────────────────────────────────────┘
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```
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## tupleDivideByNumber
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Returns a tuple with all values divided by a number. Note that division by zero will return `inf`.
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**Syntax**
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```sql
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tupleDivideByNumber(tuple, number)
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```
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**Arguments**
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- `tuple` — [Tuple](../../sql-reference/data-types/tuple.md).
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- `number` — Divider. [Int/UInt](../../sql-reference/data-types/int-uint.md), [Float](../../sql-reference/data-types/float.md) or [Decimal](../../sql-reference/data-types/decimal.md).
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**Returned value**
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- Tuple with divided values.
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Type: [Tuple](../../sql-reference/data-types/tuple.md).
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**Example**
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Query:
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```sql
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SELECT tupleDivideByNumber((1, 2), 0.5);
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```
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Result:
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```text
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┌─tupleDivideByNumber((1, 2), 0.5)─┐
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│ (2,4) │
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└──────────────────────────────────┘
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```
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## tupleConcat
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Combines tuples passed as arguments.
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``` sql
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tupleConcat(tuples)
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```
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**Arguments**
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- `tuples` – Arbitrary number of arguments of [Tuple](../../sql-reference/data-types/tuple.md) type.
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**Example**
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``` sql
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SELECT tupleConcat((1, 2), (3, 4), (true, false)) AS res
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```
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``` text
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┌─res──────────────────┐
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│ (1,2,3,4,true,false) │
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└──────────────────────┘
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```
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## tupleIntDiv
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Does integer division of a tuple of numerators and a tuple of denominators, and returns a tuple of the quotients.
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**Syntax**
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```sql
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tupleIntDiv(tuple_num, tuple_div)
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```
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**Parameters**
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- `tuple_num`: Tuple of numerator values. [Tuple](../data-types/tuple) of numeric type.
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- `tuple_div`: Tuple of divisor values. [Tuple](../data-types/tuple) of numeric type.
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**Returned value**
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- Tuple of the quotients of `tuple_num` and `tuple_div`. [Tuple](../data-types/tuple) of integer values.
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**Implementation details**
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- If either `tuple_num` or `tuple_div` contain non-integer values then the result is calculated by rounding to the nearest integer for each non-integer numerator or divisor.
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- An error will be thrown for division by 0.
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**Examples**
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Query:
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``` sql
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SELECT tupleIntDiv((15, 10, 5), (5, 5, 5));
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```
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Result:
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``` text
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┌─tupleIntDiv((15, 10, 5), (5, 5, 5))─┐
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│ (3,2,1) │
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└─────────────────────────────────────┘
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```
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Query:
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``` sql
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SELECT tupleIntDiv((15, 10, 5), (5.5, 5.5, 5.5));
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||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleIntDiv((15, 10, 5), (5.5, 5.5, 5.5))─┐
|
||
│ (2,1,0) │
|
||
└───────────────────────────────────────────┘
|
||
```
|
||
|
||
## tupleIntDivOrZero
|
||
|
||
Like [tupleIntDiv](#tupleintdiv) it does integer division of a tuple of numerators and a tuple of denominators, and returns a tuple of the quotients. It does not throw an error for 0 divisors, but rather returns the quotient as 0.
|
||
|
||
**Syntax**
|
||
|
||
```sql
|
||
tupleIntDivOrZero(tuple_num, tuple_div)
|
||
```
|
||
|
||
- `tuple_num`: Tuple of numerator values. [Tuple](../data-types/tuple) of numeric type.
|
||
- `tuple_div`: Tuple of divisor values. [Tuple](../data-types/tuple) of numeric type.
|
||
|
||
**Returned value**
|
||
|
||
- Tuple of the quotients of `tuple_num` and `tuple_div`. [Tuple](../data-types/tuple) of integer values.
|
||
- Returns 0 for quotients where the divisor is 0.
|
||
|
||
**Implementation details**
|
||
|
||
- If either `tuple_num` or `tuple_div` contain non-integer values then the result is calculated by rounding to the nearest integer for each non-integer numerator or divisor as in [tupleIntDiv](#tupleintdiv).
|
||
|
||
**Examples**
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleIntDivOrZero((5, 10, 15), (0, 0, 0));
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleIntDivOrZero((5, 10, 15), (0, 0, 0))─┐
|
||
│ (0,0,0) │
|
||
└───────────────────────────────────────────┘
|
||
```
|
||
|
||
## tupleIntDivByNumber
|
||
|
||
Does integer division of a tuple of numerators by a given denominator, and returns a tuple of the quotients.
|
||
|
||
**Syntax**
|
||
|
||
```sql
|
||
tupleIntDivByNumber(tuple_num, div)
|
||
```
|
||
|
||
**Parameters**
|
||
|
||
- `tuple_num`: Tuple of numerator values. [Tuple](../data-types/tuple) of numeric type.
|
||
- `div`: The divisor value. [Numeric](../data-types/int-uint.md) type.
|
||
|
||
**Returned value**
|
||
|
||
- Tuple of the quotients of `tuple_num` and `div`. [Tuple](../data-types/tuple) of integer values.
|
||
|
||
**Implementation details**
|
||
|
||
- If either `tuple_num` or `div` contain non-integer values then the result is calculated by rounding to the nearest integer for each non-integer numerator or divisor.
|
||
- An error will be thrown for division by 0.
|
||
|
||
**Examples**
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleIntDivByNumber((15, 10, 5), 5);
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleIntDivByNumber((15, 10, 5), 5)─┐
|
||
│ (3,2,1) │
|
||
└─────────────────────────────────────┘
|
||
```
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleIntDivByNumber((15.2, 10.7, 5.5), 5.8);
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleIntDivByNumber((15.2, 10.7, 5.5), 5.8)─┐
|
||
│ (2,1,0) │
|
||
└─────────────────────────────────────────────┘
|
||
```
|
||
|
||
## tupleIntDivOrZeroByNumber
|
||
|
||
Like [tupleIntDivByNumber](#tupleintdivbynumber) it does integer division of a tuple of numerators by a given denominator, and returns a tuple of the quotients. It does not throw an error for 0 divisors, but rather returns the quotient as 0.
|
||
|
||
**Syntax**
|
||
|
||
```sql
|
||
tupleIntDivOrZeroByNumber(tuple_num, div)
|
||
```
|
||
|
||
**Parameters**
|
||
|
||
- `tuple_num`: Tuple of numerator values. [Tuple](../data-types/tuple) of numeric type.
|
||
- `div`: The divisor value. [Numeric](../data-types/int-uint.md) type.
|
||
|
||
**Returned value**
|
||
|
||
- Tuple of the quotients of `tuple_num` and `div`. [Tuple](../data-types/tuple) of integer values.
|
||
- Returns 0 for quotients where the divisor is 0.
|
||
|
||
**Implementation details**
|
||
|
||
- If either `tuple_num` or `div` contain non-integer values then the result is calculated by rounding to the nearest integer for each non-integer numerator or divisor as in [tupleIntDivByNumber](#tupleintdivbynumber).
|
||
|
||
**Examples**
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleIntDivOrZeroByNumber((15, 10, 5), 5);
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleIntDivOrZeroByNumber((15, 10, 5), 5)─┐
|
||
│ (3,2,1) │
|
||
└───────────────────────────────────────────┘
|
||
```
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleIntDivOrZeroByNumber((15, 10, 5), 0)
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleIntDivOrZeroByNumber((15, 10, 5), 0)─┐
|
||
│ (0,0,0) │
|
||
└───────────────────────────────────────────┘
|
||
```
|
||
|
||
## tupleModulo
|
||
|
||
Returns a tuple of the moduli (remainders) of division operations of two tuples.
|
||
|
||
**Syntax**
|
||
|
||
```sql
|
||
tupleModulo(tuple_num, tuple_mod)
|
||
```
|
||
|
||
**Parameters**
|
||
|
||
- `tuple_num`: Tuple of numerator values. [Tuple](../data-types/tuple) of numeric type.
|
||
- `tuple_div`: Tuple of modulus values. [Tuple](../data-types/tuple) of numeric type.
|
||
|
||
**Returned value**
|
||
|
||
- Tuple of the remainders of division of `tuple_num` and `tuple_div`. [Tuple](../data-types/tuple) of non-zero integer values.
|
||
- An error is thrown for division by zero.
|
||
|
||
**Examples**
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleModulo((15, 10, 5), (5, 3, 2));
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleModulo((15, 10, 5), (5, 3, 2))─┐
|
||
│ (0,1,1) │
|
||
└─────────────────────────────────────┘
|
||
```
|
||
|
||
## tupleModuloByNumber
|
||
|
||
Returns a tuple of the moduli (remainders) of division operations of a tuple and a given divisor.
|
||
|
||
**Syntax**
|
||
|
||
```sql
|
||
tupleModuloByNumber(tuple_num, div)
|
||
```
|
||
|
||
**Parameters**
|
||
|
||
- `tuple_num`: Tuple of numerator values. [Tuple](../data-types/tuple) of numeric type.
|
||
- `div`: The divisor value. [Numeric](../data-types/int-uint.md) type.
|
||
|
||
**Returned value**
|
||
|
||
- Tuple of the remainders of division of `tuple_num` and `div`. [Tuple](../data-types/tuple) of non-zero integer values.
|
||
- An error is thrown for division by zero.
|
||
|
||
**Examples**
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
SELECT tupleModuloByNumber((15, 10, 5), 2);
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─tupleModuloByNumber((15, 10, 5), 2)─┐
|
||
│ (1,0,1) │
|
||
└─────────────────────────────────────┘
|
||
```
|
||
|
||
## flattenTuple
|
||
|
||
Returns a flattened `output` tuple from a nested named `input` tuple. Elements of the `output` tuple are the paths from the original `input` tuple. For instance: `Tuple(a Int, Tuple(b Int, c Int)) -> Tuple(a Int, b Int, c Int)`. `flattenTuple` can be used to select all paths from type `Object` as separate columns.
|
||
|
||
**Syntax**
|
||
|
||
```sql
|
||
flattenTuple(input)
|
||
```
|
||
|
||
**Parameters**
|
||
|
||
- `input`: Nested named tuple to flatten. [Tuple](../data-types/tuple).
|
||
|
||
**Returned value**
|
||
|
||
- `output` tuple whose elements are paths from the original `input`. [Tuple](../data-types/tuple).
|
||
|
||
**Example**
|
||
|
||
Query:
|
||
|
||
``` sql
|
||
CREATE TABLE t_flatten_tuple(t Tuple(t1 Nested(a UInt32, s String), b UInt32, t2 Tuple(k String, v UInt32))) ENGINE = Memory;
|
||
INSERT INTO t_flatten_tuple VALUES (([(1, 'a'), (2, 'b')], 3, ('c', 4)));
|
||
SELECT flattenTuple(t) FROM t_flatten_tuple;
|
||
```
|
||
|
||
Result:
|
||
|
||
``` text
|
||
┌─flattenTuple(t)───────────┐
|
||
│ ([1,2],['a','b'],3,'c',4) │
|
||
└───────────────────────────┘
|
||
```
|
||
|
||
## Distance functions
|
||
|
||
All supported functions are described in [distance functions documentation](../../sql-reference/functions/distance-functions.md).
|