The following illustrates the syntax of an aggregate function:
1
|
aggregate_function_name(DISTINCT | ALL expression)
|
In this syntax;
- First, specify the name of an aggregate function that you want to use such as
AVG
,SUM
, andMAX
. - Second, use
DISTINCT
if you want only distinct values are considered in the calculation orALL
if all values are considered in the calculation. By default,ALL
is used if you don’t specify any modifier. - Third, the
expression
can be a column of a table or an expression that consists of multiple columns with arithmetic operators.