Combine Multiple Select Statements from different tables

i have the this MYSQL SP that does SUm against different tables but i wanted the SP to return all the results in one table one row i tried using + to combine results from the selects but it gets error

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

    )
 BEGIN
 (SELECT SUM开发者_StackOverflow中文版(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;//

Error Code: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '+ (SELECT SUM(AMOUNT) AS debitTotal FROM x.Card WHERE user_Id ' at line 10 0.000 sec

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
    ) 

If you want to SUM those sums you can make query like this:

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

Use union http://dev.mysql.com/doc/refman/5.0/en/union.html If you want to get one result set....

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;//

Although I am rusty now with SQL and too lazy to check if syntax is correct, I think it should work.