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RAND « Math Numeric Functions « MySQL Tutorial
MySQL Tutorial
Math Numeric Functions
RAND
21.30.RAND
21.30.1.
RAND(), RAND(N) returns a random floating-point value v in the range 0 <= v < 1.0.
21.30.2.
RAND(20)
21.30.3.
To obtain a random integer in the range the range 7 <= R < 12