When using an aggregate function, you need to add a HAVING statement to achieve the same filtering effect as a WHERE statement.

Syntax

  SELECT [ ALL | DISTINCT ]{ * | projectItem [, projectItem ]* }
  FROM tableExpression
  [ WHERE booleanExpression ]
  [ GROUP BY { groupItem [, groupItem ]* } ]
  [ HAVING booleanExpression ];

Example

  • Test data
    Customer OrderPrice
    Bush 1000
    Carter 1600
    Bush 700
    Bush 300
    Adams 2000
    Carter 100
  • Test statement 
    SELECT Customer,SUM(OrderPrice) FROM XXX
GROUP BY Customer
HAVING SUM(OrderPrice)<2000;
  • Test result
    Customer SUM(OrderPrice)
    Carter 1700