SQL FunctionsNumeric FunctionsATANOn this pageATANReturns the arc tangent of x, that is, the value whose tangent is x. Syntax ATAN( <x> ) Examples SELECT ATAN(-2);┌─────────────────────┐│ atan((- 2)) │├─────────────────────┤│ -1.1071487177940906 │└─────────────────────┘