ClickHouse/docs/en/functions/in_functions.md
BayoNet 13d9a4eebe Sources for english documentation switched to Markdown.
Edit page link is fixed too for both language versions of documentation.
2017-12-28 18:13:23 +03:00

19 lines
845 B
Markdown

# 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 can't 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.