Question

我有这个MYSQL SP对不同的表执行SUm但是我希望SP在一个表中返回所有结果我尝试使用+来组合选择的结果但是它得到错误

 DROP PROCEDURE IF EXISTS x.GetFinanceContent;
 delimiter //
 CREATE PROCEDURE x.GetFinanceContent
    (
         IN  userId INT

    )
 BEGIN
 (SELECT SUM(AMOUNT) AS creditTotal
    FROM x.Card1 
    WHERE user_Id = userId and card_type=1) 
    +

 (SELECT SUM(AMOUNT) AS debitTotal
    FROM x.Card2 
    WHERE user_Id = userId and card_type=2) 


 END;//

错误代码：1064您输入了错误你的SQL语法;检查手册对应于您的MySQL服务器用于正确语法的版本靠近'+（SELECT SUM（AMOUNT）AS debitTotal 来自x.Card 用户名_Id'在第10行0.000秒

Answer 1

SELECT 
    ( SELECT SUM(AMOUNT) AS creditTotal
      FROM x.Card1
      WHERE user_Id = userId AND card_type=1
    )  
  , ( SELECT SUM(AMOUNT) AS debitTotal
      FROM x.Card2
      WHERE user_Id = userId AND card_type=2
    )

Answer 2

如果你想要求和这些总和，你可以这样查询：

SELECT ((SELECT SUM(AMOUNT) AS creditTotal
    FROM x.Card1 
    WHERE user_Id = userId and card_type=1) + 
(SELECT SUM(AMOUNT) AS debitTotal
    FROM x.Card2 
    WHERE user_Id = userId and card_type=2)) as total

使用union http://dev.mysql.com/doc/refman/5.0/en/union.html如果您想获得一个结果集....

DROP PROCEDURE IF EXISTS x.GetFinanceContent;
 delimiter //
 CREATE PROCEDURE x.GetFinanceContent
    (
         IN  userId INT

    )
 BEGIN
 (SELECT SUM(AMOUNT) AS creditTotal
    FROM x.Card1 
    WHERE user_Id = userId and card_type=1) 

 UNION

 (SELECT SUM(AMOUNT) AS debitTotal
    FROM x.Card2 
    WHERE user_Id = userId and card_type=2) 


 END;//

虽然我现在厌倦了SQL并且懒得检查语法是否正确，但我认为它应该可行。

合并来自不同表的多个选择语句

2 个答案: