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109 lines
5.4 KiB
Markdown
109 lines
5.4 KiB
Markdown
---
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slug: /en/sql-reference/aggregate-functions/reference/intervalLengthSum
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sidebar_position: 155
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sidebar_label: intervalLengthSum
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title: intervalLengthSum
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---
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Calculates the total length of union of all ranges (segments on numeric axis).
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**Syntax**
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``` sql
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intervalLengthSum(start, end)
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```
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**Arguments**
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- `start` — The starting value of the interval. [Int32](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [Int64](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [UInt32](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [UInt64](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [Float32](../../../sql-reference/data-types/float.md#float32-float64), [Float64](../../../sql-reference/data-types/float.md#float32-float64), [DateTime](../../../sql-reference/data-types/datetime.md#data_type-datetime) or [Date](../../../sql-reference/data-types/date.md#data_type-date).
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- `end` — The ending value of the interval. [Int32](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [Int64](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [UInt32](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [UInt64](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64), [Float32](../../../sql-reference/data-types/float.md#float32-float64), [Float64](../../../sql-reference/data-types/float.md#float32-float64), [DateTime](../../../sql-reference/data-types/datetime.md#data_type-datetime) or [Date](../../../sql-reference/data-types/date.md#data_type-date).
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:::note
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Arguments must be of the same data type. Otherwise, an exception will be thrown.
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:::
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**Returned value**
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- Total length of union of all ranges (segments on numeric axis). Depending on the type of the argument, the return value may be [UInt64](../../../sql-reference/data-types/int-uint.md#uint8-uint16-uint32-uint64-int8-int16-int32-int64) or [Float64](../../../sql-reference/data-types/float.md#float32-float64) type.
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**Examples**
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1. Input table:
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``` text
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┌─id─┬─start─┬─end─┐
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│ a │ 1.1 │ 2.9 │
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│ a │ 2.5 │ 3.2 │
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│ a │ 4 │ 5 │
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└────┴───────┴─────┘
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```
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In this example, the arguments of the Float32 type are used. The function returns a value of the Float64 type.
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Result is the sum of lengths of intervals `[1.1, 3.2]` (union of `[1.1, 2.9]` and `[2.5, 3.2]`) and `[4, 5]`
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Query:
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``` sql
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SELECT id, intervalLengthSum(start, end), toTypeName(intervalLengthSum(start, end)) FROM fl_interval GROUP BY id ORDER BY id;
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```
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Result:
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``` text
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┌─id─┬─intervalLengthSum(start, end)─┬─toTypeName(intervalLengthSum(start, end))─┐
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│ a │ 3.1 │ Float64 │
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└────┴───────────────────────────────┴───────────────────────────────────────────┘
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```
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2. Input table:
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``` text
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┌─id─┬───────────────start─┬─────────────────end─┐
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│ a │ 2020-01-01 01:12:30 │ 2020-01-01 02:10:10 │
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│ a │ 2020-01-01 02:05:30 │ 2020-01-01 02:50:31 │
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│ a │ 2020-01-01 03:11:22 │ 2020-01-01 03:23:31 │
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└────┴─────────────────────┴─────────────────────┘
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```
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In this example, the arguments of the DateTime type are used. The function returns a value in seconds.
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Query:
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``` sql
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SELECT id, intervalLengthSum(start, end), toTypeName(intervalLengthSum(start, end)) FROM dt_interval GROUP BY id ORDER BY id;
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```
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Result:
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``` text
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┌─id─┬─intervalLengthSum(start, end)─┬─toTypeName(intervalLengthSum(start, end))─┐
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│ a │ 6610 │ UInt64 │
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└────┴───────────────────────────────┴───────────────────────────────────────────┘
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```
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3. Input table:
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``` text
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┌─id─┬──────start─┬────────end─┐
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│ a │ 2020-01-01 │ 2020-01-04 │
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│ a │ 2020-01-12 │ 2020-01-18 │
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└────┴────────────┴────────────┘
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```
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In this example, the arguments of the Date type are used. The function returns a value in days.
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Query:
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``` sql
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SELECT id, intervalLengthSum(start, end), toTypeName(intervalLengthSum(start, end)) FROM date_interval GROUP BY id ORDER BY id;
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```
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Result:
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``` text
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┌─id─┬─intervalLengthSum(start, end)─┬─toTypeName(intervalLengthSum(start, end))─┐
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│ a │ 9 │ UInt64 │
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└────┴───────────────────────────────┴───────────────────────────────────────────┘
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```
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