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system.numbers

This table contains a single UInt64 column named number that contains almost all the natural numbers starting from zero.

You can use this table for tests, or if you need to do a brute force search.

Reads from this table are parallelized too.

Used for tests.

SELECT avg(number) FROM numbers(100000000);
+-------------+
| avg(number) |
+-------------+
| 49999999.5 |
+-------------+