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In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning or measurement such as a set, a bag or a list. Common aggregate functions include : Average() (i.e., arithmetic mean)
Table 13.25 Aggregate (GROUP BY) Functions. This section describes group (aggregate) functions that operate on sets of values. Unless otherwise stated, group functions ignore NULL values. If you use a group function in a statement containing no GROUP BY clause, it is equivalent to grouping on all rows. For more information, see Section 13.19.3, âMySQL Handling of GROUP BYâ. For numeric arguments, the variance and standard deviation functions return a DOUBLE value.