Numeric Functions in Schemes

The schemes use the following functions:

AVG(expr): The average or mean of expr; if x is an attribute, AVG(x) is the sum of the values of x divided by the number of values.
EXP(x): The constant e raised to the xth power, where e is approximately equal to 2.71828183.
LN(x): The natural logarithm of x, that is, the power to which e must be raised to equal x; x must be > 0.
LOG(10,x): The logarithm to the base 10 of x, that is, the power to which 10 must be raised to equal x (LOG(10,100)=2); x must be > 0.
MAX(expr): The maximum value of expr; if x is an attribute, MAX(x) is the maximum of the values of x.
MIN(expr): The minimum value of expr; if x is an attribute, MIN(x) is the minimum of the values of x.
SQRT(x): The square root of x, that is, the number whose square is x (SQRT(x)*SQRT(x)=x); x must be >= 0.
STDDEV(expr): The standard deviation of expr. Standard deviation is the square root of variance.
VARIANCE(expr): The variance of expr. If expr has one row, the variance is 0; otherwise, the variance is VAR_SAMP(expr), the sample variance of a set of numbers after discarding the nulls in the set.

For more information about these functions, see the Oracle Database SQL Reference.