ClickHouse/docs/en/query_language/table_functions/numbers.md

numbers

numbers(N) — Returns a table with the single number column (UInt64) that contains integers from 0 to N-1. numbers(N, M) — Returns a table with the single number column (UInt64) that contains integers from N to (N + M - 1).

Similar to the system.numbers table, it can be used for testing and generating successive values. The numbers(N, M) function is more efficient than a selection from system.numbers.

The following queries are equivalent:

SELECT * FROM numbers(10);
SELECT * FROM numbers(0,10);
SELECT * FROM system.numbers LIMIT 10;

Examples:

-- generate a sequence of all dates from 2010-01-01 to 2010-12-31
select toDate('2010-01-01') + number as d FROM numbers(365);