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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)
SQL Aggregate functions. Discussion in 'SQL PL/SQL' started by SBH, Oct 16, 2010. The article explains the Aggregate functions in SQL. 1. Apart from the single row functions like CONCAT, SUBSTR, INSTR, NVL and others, Oracle provides Aggregate functions also. Unlike single Row SQL functions, Aggregate functions operate on GROUPS. They are not data manipulation functions but derive and produce additional information from the selected columns.