Aggregate SQL Functions

For all aggregations other than COUNT( * ), NULL and missing values are ignored.

Function	SQLite	Description
AVG( num_expr )		Computes the average of num_expr for the rows in the group. Num_expr must be numeric.
COUNT( expr ) COUNT( * )		Counts the number of times expr is not NULL in the group. COUNT( * ) returns the total number of rows in the group.
GROUP_CONCAT( expr, <separator = ’,’> )	Yes	Concatenates all non-NULL values of expr and returns them as a string. Numeric values of expr are converted to character. If separator is present, it is placed between the values. The default separator is a comma. DISTINCT can be used only with GROUP_CONCAT() if separator is not specified.
MAX( expr )		Returns the maximum value of expr in the group. Expr can be character or numeric.
MIN( expr )		Returns the minimum value of expr in the group. Expr can be character or numeric.
STDDEV_POP( num_expr )		Computes the population standard deviation of num_expr for the group.
STDDEV_SAMP( num_expr )		Computes the sample standard deviation of all num_expr for the group.
SUM( num_expr )		Returns the sum of num_expr for the group. If no non-NULL values are found, SUM() returns NULL.
TOTAL( num_expr )	Yes	Same as SUM( num_expr ), except TOTAL() returns 0.0 if no non-NULL values are found.
VAR_POP( num_expr )		Computes the population variance of num_expr for the group.
VAR_SAMP( num_expr )		Computes the sample variance of num_expr for the group.