ClickHouse/docs/en/sql-reference/functions/in-functions.md
Ivan Blinkov cd14f9ebcb
SQL reference refactoring (#10857)
* split up select.md

* array-join.md basic refactoring

* distinct.md basic refactoring

* format.md basic refactoring

* from.md basic refactoring

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* having.md basic refactoring

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* into-outfile.md basic refactoring

* join.md basic refactoring

* limit.md basic refactoring

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* order-by.md basic refactoring

* prewhere.md basic refactoring

* adjust operators/index.md links

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* basic refactor of remaining select clauses

* absolute paths in make_links.sh

* run make_links.sh

* remove old select.md locations

* translate docs/es

* translate docs/fr

* translate docs/fa

* remove old operators.md location

* change operators.md links

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* minor texts adjustments

* wip

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* fix changelog

* es build fixes

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2020-05-15 07:34:54 +03:00

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---
toc_priority: 60
toc_title: Implementing the IN Operator
---
# Functions for Implementing the IN Operator {#functions-for-implementing-the-in-operator}
## in, notIn, globalIn, globalNotIn {#in-functions}
See the section [IN operators](../operators/in.md#select-in-operators).
## tuple(x, y, …), operator (x, y, …) {#tuplex-y-operator-x-y}
A function that allows grouping multiple columns.
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.
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 cant be written to a table.
## tupleElement(tuple, n), operator x.N {#tupleelementtuple-n-operator-x-n}
A function that allows getting a column from a tuple.
N is the column index, starting from 1. N must be a constant. N must be a constant. N must be a strict postive integer no greater than the size of the tuple.
There is no cost to execute the function.
[Original article](https://clickhouse.tech/docs/en/query_language/functions/in_functions/) <!--hide-->