SQL Average

SQL uses the AVG( ) function to calculate the average of a column. The syntax for using this function is,

SELECT AVG("column_name")
FROM "table_name"

For example, if we want to get the average of all sales from the following table,

Table Store_Information

store_name	Sales	Date
Los Angeles	$1500	Jan-05-1999
San Diego	$250	Jan-07-1999
Los Angeles	$300	Jan-08-1999
Boston	$700	Jan-08-1999

we would type in

SELECT AVG(Sales) FROM Store_Information

Result:

$687.5 represents the average of all Sales entries: ($1500 + $250 + $300 + $700) / 4.