Question

您好我正在做一个子查询来获取cTL列的值但是我需要在子查询中使用外部列的值来获得正确的响应但我得到错误，它不承认SC和RC变量。任何出路？

SELECT DISTINCT(cStoreCode) as SC
    ,cRetailerCode as RC
    , cStoreCode + ' - ' + cStoreName AS Store,
    x.TeamLead 
FROM
(
    SELECT cTL as TeamLead 
    FROM tblEmpSchedule 
    WHERE   cRepCode LIKE @repCode AND
        cClientCode LIKE @gCode AND
        cProjectCode LIKE @pCode AND
        cYear LIKE @year AND
        cCycleNo LIKE @cycleNo AND
        cRetailerCode LIKE @retailerCode AND
        cStoreCode = SC AND
        cRetailerCode = RC
 )x
,tblEmpSchedule 
WHERE cRepCode LIKE @repCode AND
    cClientCode LIKE @gCode AND
    cProjectCode LIKE @pCode AND
    cYear LIKE @year AND
    cCycleNo LIKE @cycleNo AND
    cRetailerCode LIKE @retailerCode AND
    cStoreCode <> '' AND cStoreCode is Not Null
ORDER BY cStoreCode

Answer 1

看起来你需要SC / RC周围的单引号：

cStoreCode = 'SC' AND
cRetailerCode = 'RC'

编辑：

请检查以下内容以确定它是否有效：

SELECT cTL as TeamLead 
FROM tblEmpSchedule t1
INNER JOIN 
(
  SELECT DISTINCT(cStoreCode) SC
    , cRetailerCode RC
    , cStoreCode + ' - ' + cStoreName AS Store
  FROM tblEmpSchedule
)t2

  on t1.cTL = t2.cTL
WHERE t1.cRepCode LIKE @repCode 
  AND t1.cClientCode LIKE @gCode 
  AND t1.cProjectCode LIKE @pCode 
  AND t1.cYear LIKE @year 
  AND t1.cCycleNo LIKE @cycleNo 
  AND t1.cRetailerCode LIKE @retailerCode 
  AND (t1.cStoreCode <> '' AND t1.cStoreCode is Not Null)
  AND t1.cStoreCode = t2.SC
  AND t1.cRetailerCode = t2.RC
ORDER BY  t1.cStoreCode

Answer 2

不，您不能在WHERE子句中引用类似表达式的别名。只有来自内联视图或CTE（在FROM子句中引用）的WHERE子句中才能引用表达式的别名。

使用DISTINCT关键字看起来很奇怪。没有必要在括号中的SELECT列表中包装第一个表达式。你的构造使它几乎看起来像是一个函数调用。（不是，DISTINCT关键字适用于SELECT列表中的所有表达式。）

为什么你需要在这里进行JOIN操作并不清楚。

我讨厌用一个问题回答一个问题，但是......你想通过使用内联视图来获取来自作为TeamLead别名的cTL列的值来获得什么？应该解决什么问题？为什么表需要引用两次？

以另一种方式提出同样的问题...

tblEmpSchedule表上的查询返回的结果集有什么“错误”，就像这个？

SELECT DISTINCT s.cStoreCode             AS sc
     , s.cRetailerCode                   AS rc
     , s.cStoreCode + ' - ' + cStoreName AS Store
     , s.cTL                             AS TeamLead
  FROM tblEmpSchedule s
 WHERE s.cRepCode LIKE @repCode AND
       s.cClientCode LIKE @gCode AND
       s.cProjectCode LIKE @pCode AND
       s.cYear LIKE @year AND
       s.cCycleNo LIKE @cycleNo AND
       s.cRetailerCode LIKE @retailerCode AND
       s.cStoreCode <> ''
 ORDER BY s.cStoreCode

如果您可以解释为什么此查询返回的结果集与您需要的结果集不同，那么我（或其他人）可能会提供帮助。正如你的问题所在，目前尚不清楚你想要实现的目标。

注意：查询中的“cStoreCode IS NOT NULL”谓词是多余的。如果“cStoreCode <> ''”谓词返回TRUE，我们就知道它不能为NULL。

在子查询中使用外部查询列

2 个答案: