SQRT

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The SQRT function returns the square root of a number.

expression
An expression that returns a value of any built-in numeric, character-string, or graphic-string data type. A string argument is converted to double-precision floating point before evaluating the function. For more information on converting strings to double-precision floating point, see DOUBLE_PRECISION or DOUBLE. The value of expression must be greater than or equal to zero.

The data type of the result is double-precision floating point. If the argument can be null, the result can be null; if the argument is null, the result is the null value.

Example