在 ms-access 中联合查询后应用 sum

Question

我在 MS-ACCESS 2010 中有一个 sql 查询，如下所示：

SELECT 
    EXC AS MY_EXC, 
    COUNT(FC_CUSIP) AS MY_FC_CUSIP
FROM 
    TESTDATA  t 
WHERE 
    FC_CUSIP <> "NULL" 
GROUP BY 
    EXC
UNION ALL
SELECT 
    EXC AS MY_EXC, 
    0 AS MY_FC_CUSIP
FROM 
    TESTDATA  t 
WHERE 
    FC_CUSIP = "NULL" 
GROUP BY 
    EXC
ORDER BY 
    MY_EXC ASC; 

结果如下：

MY_EXC  |   MY_FC_CUSIP
--------+---------------
AA      |   0
AM      |   0
AM      |   9
BB      |   0
DD      |   10
DD      |   0
F       |   0
I       |   0
NM      |   0
NM      |   131
NY      |   0
NY      |   184
OO      |   0
OO      |   14
PC      |   0
VA      |   0
Z       |   0
Z       |   2

我需要一个进一步的 sql，它可以给出如下结果： 基本上它会区分 MY_EXC 并总结 MY_FC_CUSIP

MY_EXC  |   MY_FC_CUSIP
--------+---------------
AA      |   0
AM      |   9    
BB      |   0    
DD      |   10
F       |   0
I       |   0
NM      |   131
NY      |   184
OO      |   14
PC      |   0
VA      |   0
Z       |   2

请以任何方式帮助我...实际上我正在通过 VBA 动态创建整个 sql 字符串。

Answer 1

SELECT a.MY_EXC, SUM(a.MY_FC_CUSIP)
FROM (SELECT EXC AS MY_EXC, COUNT(FC_CUSIP) AS MY_FC_CUSIP
      FROM TESTDATA  t 
      WHERE FC_CUSIP <> "NULL" 
      GROUP BY EXC
      UNION ALL
      SELECT EXC AS MY_EXC, 0 AS MY_FC_CUSIP
      FROM TESTDATA  t 
      WHERE FC_CUSIP = "NULL" 
      GROUP BY EXC) 
GROUP BY a.MY_EXC 

Answer 2

MS Access 不支持子查询中的union。但是，在您的情况下，您可以简化查询：

SELECT EXC AS MY_EXC,
       SUM(IIF(FC_CUSIP <> "NULL", 1, 0)) AS MY_FC_CUSIP
FROM TESTDATA
GROUP BY EXC
ORDER BY MY_EXC ASC;