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The AVG function calculates the average of a specified column. It works only on a numeric column. It first sums up all data and then divides it by the total number of rows.For example if the sum of 5 items is 10 then average is 10/5 = 2.
SQL AVG() Syntax
The FIRST function returns the first value of the selected column. FIRST function is not standard SQL function so it cannot be used with other DBMS like MySQL. However this is very useful with MS Access OR SQL Server.
SQL FIRST() Syntax