ROUNDDOWN(number[,digits])
ROUNDDOWN function rounds a given number towards 0.
number is the number you want rounded toward 0 and digits is the number of digits to which you want to round that number.
ROUNDDOWN(5.5) equals 5.
ROUNDDOWN(-3.3) equals -3.
ROUNDDOWN(1501.15,1) equals 1501.1.
ROUNDDOWN(1501.15,-2) equals 1500.0.