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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* prewhere.md basic refactoring

* adjust operators/index.md links

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* basic refactor of remaining select clauses

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* remove old select.md locations

* translate docs/es

* translate docs/fr

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* remove old operators.md location

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

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60 Implementing the IN Operator

Functions for Implementing the IN Operator

in, notIn, globalIn, globalNotIn

See the section IN operators.

tuple(x, 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

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