ABS : returns the absolute value of 'n'
SELECT ABS(-15) "Absolute" FROM dual;
POWER(m,n) : returns m raised to the nth power,n must be integer
SELECT POWER(3,2) "raised" FROM dual;
ROUND(n,m) : returns n rounded to m places to the right of decimal point.
SELECT ROUND(15.19,1) FROM DUAL;
SELECT ROUND(15.15,1) FROM DUAL;
SQRT :
SELECT SQRT(25) FROM DUAL;