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Returns the square root of a number.
SQRT( numeric-expression )
The number for which the square root is to be calculated.
This function converts its argument to DOUBLE, performs the computation in double-precision floating-point arithmetic, and
returns a DOUBLE as the result.
The SQRT function comprises part of optional SQL/2008 language feature T621, "Enhanced numeric functions".
The following statement returns the value 3.
SELECT SQRT( 9 );