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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)
If youâre a bit rusty on either subject, I encourage you to review them before continuing this article. Thatâs because we will dig further into aggregate functions by pairing them with JOINs. This duo unleashes the full possibilities of SQL aggregate functions and allows us to perform computations on multiple tables in a single query. What Do SQL Aggregate Functions Do? Hereâs a quick overview of the most common SQL aggregate functions: