在使用聚合函数时，您需要添加HAVING语句，以实现与WHERE语句一样的过滤效果。

语法

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

示例

  • 测试数据
    Customer OrderPrice
    Bush 1000
    Carter 1600
    Bush 700
    Bush 300
    Adams 2000
    Carter 100
  • 测试语句 
    SELECT Customer,SUM(OrderPrice) FROM XXX
GROUP BY Customer
HAVING SUM(OrderPrice)<2000;
  • 测试结果
    Customer SUM（OrderPrice）
    Carter 1700