The ABS and ABSVAL numeric functions return the absolute value of a supplied number.
The absolute value of the source number is a number with the same magnitude as the source but without a sign. The parameter must be a numeric value. The result is of the same type as the parameter unless it is NULL, in which case the result is NULL.
ABS( -3.7 )returns 3.7
ABS( 3.7 )returns 3.7
ABS( 1024 )returns 1024
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