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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)
returns the total number of values in a given column. COUNT(*) returns the number of rows in a table. Aggregate functions are used to compute against a returned column of numeric data from your SELECT statement. They basically summarize the results of a particular column of selected data. We are covering these here since they are required by the next topic, GROUP BY.