ClickHouse/docs/en/data_types/tuple.md
2018-03-25 05:04:22 +03:00

7 lines
547 B
Markdown
Executable File

# Tuple(T1, T2, ...)
Tuples can't be written to tables (other than Memory tables). They are used for temporary column grouping. Columns can be grouped when an IN expression is used in a query, and for specifying certain formal parameters of lambda functions. For more information, see "IN operators" and "Higher order functions".
Tuples can be output as the result of running a query. In this case, for text formats other than JSON\*, values are comma-separated in brackets. In JSON\* formats, tuples are output as arrays (in square brackets).