SQRT returns the square root of n.
This function takes as an argument any numeric data type or any nonnumeric data type that can be implicitly converted to a numeric data type. The function returns the same data type as the numeric data type of the argument.
If n resolves to a NUMBER, then the value n cannot be negative. SQRT returns a real number.
If n resolves to a binary floating-point number (BINARY_FLOAT or BINARY_DOUBLE):
If n >= 0, then the result is positive.
If n = -0, then the result is -0.
If n < 0, then the result is NaN.
The following example returns the square root of 26:
SELECT SQRT(26) "Square root" FROM DUAL; Square root ----------- 5.09901951
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