ClickHouse/docs/en/sql-reference/statements/select/all.md

toc_title
ALL

ALL Clause

SELECT ALL is identical to SELECT without DISTINCT.

• If ALL specified, ignore it.
• If both ALL and DISTINCT specified, exception will be thrown.

ALL can also be specified inside aggregate function with the same effect(noop), for instance:

SELECT sum(ALL number) FROM numbers(10);

equals to

SELECT sum(number) FROM numbers(10);