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Returns the arc sine of x, that is, the value whose sine is x. Returns NULL if x is not in the range -1 to 1.

func.asin( <x> )
func.asin(0.2)
┌────────────────────┐
│ func.asin(0.2) │
├────────────────────┤
0.2013579207903308
└────────────────────┘
ASIN( <x> )
SELECT ASIN(0.2);
┌────────────────────┐
asin(0.2) │
├────────────────────┤
0.2013579207903308
└────────────────────┘