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Returns a random floating-point value v in the range 0 <= v < 1.0. To obtain a random integer R in the range i <= R < j, use the expression FLOOR(i + RAND() * (j − i)). Argument n is used as the seed value. For equal argument values, RAND(n) returns the same value each time , and thus produces a repeatable sequence of column values.

func.rand( <n>)
func.rand(1)
┌────────────────────┐
│ func.rand(1) │
├────────────────────┤
0.7133693869548766
└────────────────────┘
RAND( <n>)
SELECT RAND(1);
┌────────────────────┐
rand(1) │
├────────────────────┤
0.7133693869548766
└────────────────────┘