查詢沒有給我的預期結果

Question

AP表

id tid  code pid  cl   date 
1 1  1002 17  DC  2011-04-05 16:14:37  
2 1  1002 18  DC  2011-04-05 16:14:37  
3 1  1002 19  DC  2011-04-05 16:14:37  
4 2  1002 12  SC  2011-04-05 16:15:59  
5 2  1002 9  SC  2011-04-05 16:15:59  
6 2  1002 21  SC  2011-04-05 16:15:59  
7 3  1003 20  DC  2011-04-07 14:57:40  
8 3  1003 12  DC  2011-04-07 14:57:40  
9 3  1003 9  DC  2011-04-07 14:57:40  
10 3  1003 21  DC  2011-04-07 14:57:40  
11 4  1002 18  SC  2011-04-08 18:10:04  
12 4  1002 19  SC  2011-04-08 18:10:04  
13 4  1002 22  SC  2011-04-08 18:10:04  
14 5  1001 17  SC  2011-04-08 18:21:10  

在表

tid totalamount  code pstatus  cdate 
    1 65.98   1002  R  2011-04-05 16:14:37 
    2 17.74   1002  R  2011-04-05 16:15:59  
    3 96.36   1003  R  2011-04-07 14:57:40  
    4 25.94   1002  S  2011-04-08 18:10:04  
    5 9    1001  R  2011-05-08 18:21:10  

我想這樣的，但它不是正確

SELECT at.totalamount, at.pstatus, ap.cl 
FROM `at` AS at 
INNER JOIN ap AS ap ON at.`code` = ap.`code` 
WHERE ap.cl = 'SC' 
AND at.`code` = '1002' 
GROUP BY at.`code` 
LIMIT 0 , 30 

我預期的結果

pstatus->S pstatus->R 


code Stotalamount Rtotalamount Sstatus Rstatus cl 
1002 25.94   17.74   S   R  SC 

請任何身體告訴我正確的查詢

Answer 1

看來你要添加的totalamount兩次，一次是在R狀態，另一個用於S狀態。

但我不明白你是如何加入ap表和爲什麼65.98未被添加。連接是否應該在日期列上完成？

這可能工作，但你必須用不同的數據測試它，以確保。或者更多地解釋兩個表中的列代表的內容以及您希望查詢顯示的內容。

SELECT at.code 
    , SUM(IF(at.pstatus='S', at.totalamount, 0)) 
     AS Stotalamount 
    , SUM(IF(at.pstatus='R', at.totalamount, 0)) 
     AS Rtotalamount 
FROM at 
WHERE EXISTS 
    (SELECT 1 
    FROM ap 
    WHERE at.code = ap.code 
     AND at.cdate = ap.date 
     AND ap.cl = 'SC' 
) 
    AND at.code = 1002 
GROUP BY at.code 
LIMIT 0 , 30