thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-09-25 19:20:52 +00:00
Code Issues Packages Projects Releases Wiki Activity
60ab3294b1
ClickHouse/docs/en/functions/random_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

726 B
Raw Blame History

Functions for generating pseudo-random numbers

Non-cryptographic generators of pseudo-random numbers are used.

All the functions accept zero arguments or one argument. If an argument is passed, it can be any type, and its value is not used for anything. The only purpose of this argument is to prevent common subexpression elimination, so that two different instances of the same function return different columns with different random numbers.

rand

Returns a pseudo-random UInt32 number, evenly distributed among all UInt32-type numbers. Uses a linear congruential generator.

rand64

Returns a pseudo-random UInt64 number, evenly distributed among all UInt64-type numbers. Uses a linear congruential generator.