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21 lines
1000 B
Markdown
21 lines
1000 B
Markdown
# Functions for implementing the IN operator
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## in, notIn, globalIn, globalNotIn { #in-functions}
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See the section [IN operators](../select.md#select-in-operators).
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## tuple(x, y, ...), operator (x, y, ...)
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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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## tupleElement(tuple, n), operator x.N
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A function that allows getting a column from a tuple.
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'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.
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There is no cost to execute the function.
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[Original article](https://clickhouse.tech/docs/en/query_language/functions/in_functions/) <!--hide-->
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