SQL FunctionsNumeric FunctionsACOSOn this pageACOSReturns the arc cosine of x, that is, the value whose cosine is x. Returns NULL if x is not in the range -1 to 1.SyntaxACOS( <x> )ExamplesSELECT ACOS(1);┌─────────┐│ acos(1) │├─────────┤│ 0 │└─────────┘