Question

我有多张桌子，我只用3来测试。我不知道这是否是正确的方法。

AccntTbl

  id    accnt   amount    date
---------------------------------
  1      xxx     10.00   1/1/2016
  2      yyy     20.00   1/1/2016
  3      zzz     30.00   1/1/2016

SupplyTbl

  id   accnt    supply   date
-------------------------------
  1     xxx     5.00     1/10/2016
  1     xxx     5.00     2/14/2016

IssuedTbl

  id   accnt    issued  date
---------------------------------
  1     xxx      3.00   1/9/2016
  1     xxx      2.00   2/1/2016

如果过滤到JANUARY

，结果将是这样的

    id    accnt    amount   issued   balance   
   --------------------------------------------
    1     xxx      15.00     3.00     12.00    
    2     yyy      20.00     0.00     20.00    
    3     zzz      30.00     0.00     30.00

如果是FEBRUARY

   id    accnt    amount    issued   balance    
  ---------------------------------------------
    1     xxx      20.00     5.00    15.00      
    2     yyy      20.00     0.00     0.00      
    3     zzz      30.00     0.00     0.00

这是我提出的问题

SELECT accnttbl.id, 
       accnttbl.accnt, 
       Sum(accnttbl.amount) 
       + Sum(SupplyTbl.supply) AS amount, 
       issuedtbl.issued 
FROM   accnttbl 
       LEFT JOIN (SELECT id, 
                         Sum(supply) AS supply, 
                         date 
                  FROM   supplytbl 
                  GROUP  BY id, 
                            date) AS SupplyTbl 
              ON accnttbl.id = SupplyTbl.id 
                 AND Month(SupplyTbl.date) BETWEEN 1 AND 2 
       LEFT JOIN (SELECT id. Sum(issued) AS issued, 
                         date 
                  FROM   issuedtbl 
                  GROUP  BY id, 
                            date) 
              ON accnttbl.id = issuedtbl.id 
                 AND Month(issuedtbl.date) BETWEEN 1 AND 2 
WHERE  Year(accnttbl.date) = 2016 
GROUP  BY accnttbl.id, 
          accnttbl.accnt

我有点搞砸......很高兴得到任何帮助：）

结果就像这样...... 1月份

id    accnt   amount   issued

1      xxx     30.00      10.00 
2      yyy     20.00       0.00

和在FEBRUARY

1      xxx     60.00      20.00
2      yyy     20.00       0.00

用我给出的值......只是..它自己加倍了......结果是错的......为什么？

Answer 1

尝试如下：

SELECT AccntTbl.id, AccntTbl.accnt
    , SUM(AccntTbl.amount) + SUM(SupplyTbl.supply) as amount
    , SUM(IssuedTbl.issued) as issued
    , (SUM(amount) - SUM(issued)) as balance
    FROM   AccntTbl LEFT JOIN 
           (SELECT id, COALESCE(SUM(supply), 0) AS supply, date FROM SupplyTbl 
                  GROUP By id, date) AS SupplyTbl
    ON     AccntTbl.id = SupplyTbl.id AND (MONTH(SupplyTbl.date) BETWEEN 
                                           1 AND 2) 
                    LEFT JOIN 
           (SELECT id, COALESCE(SUM(issued),0) as issued, date from IssuedTbl
                  GROUP By id, date )
    ON     AccntTbl.id = IssuedTbl.id AND (MONTH(IssuedTbl.date) BETWEEN 
                                           1 AND 2)    
    WHERE (YEAR(AccntTbl.date) = 2016)
    GROUP By AccntTbl.id, AccntTbl.accnt
    ;

在sql中，NULL添加的任何内容都是NULL。因此，如果您未使用COALESCE，则在您的子查询中，您将使用NULL添加您的值，因此您无法获得所需的结果。

使用过滤器连接多个表

1 个答案: