When passing a single argument to an aggregate function, that argument can be preceded by the keyword DISTINCT, which filters out duplicate values.
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. |