2

我有一个包含多个日期的多条记录的表。

我试图查看“日期 1”和“日期 2”之间的区别，并且我的完整外部连接没有返回我期望的数据。

我知道日期 1 有 13278 行，日期 2 有 13282 - 因此我希望看到至少 13282 行，但我得到 13195 ......这是一个INNER JOIN（我测试过）。

我希望得到如下结果：

001     000123    009    NULL    1000
001     000124    009    1000    1000
001     000125    009    1000    1000
001     000126    009    1000    NULL

但这不会从任何一方获得任何空行？

SELECT 
    COALESCE(c.AccountBranch, p.AccountBranch)
    , COALESCE(c.AccountNumber, p.AccountNumber)
    , COALESCE(c.AccountSuffix, p.AccountSuffix)
    , c.PrincipleAmount
    , p.PrincipleAmount
    FROM ADStaging..cb_account_extension_principle_dpd c
    FULL OUTER JOIN ADStaging..cb_account_extension_principle_dpd p
        ON p.AccountBranch = c.AccountBranch
        AND p.AccountNumber = c.AccountNumber
        AND p.AccountSuffix = c.AccountSuffix
WHERE 
    (c.BusinessDataDate IS NULL OR c.BusinessDataDate = @CurrentBusinessDataDate)
    AND
    (p.BusinessDataDate IS NULL OR p.BusinessDataDate = @PreviousBusinessDataDate)

这行得通 - 将连接的“键”组合在两个单独的选择语句中？

SELECT
      COALESCE(C.Account, P.Account) AS Account
    , COALESCE(C.AccountBranch, P.AccountBranch) as AccountBranch
    , COALESCE(C.AccountNumber, P.AccountNumber) as AccountNumber
    , COALESCE(C.AccountSuffix, P.AccountSuffix) as AccountSuffix
    , P.PrincipleAmount AS PreviousAmount
    , C.PrincipleAmount AS CurrentAmount
    , ISNULL(C.PrincipleAmount, P.PrincipleAmount) - ISNULL(P.PrincipleAmount,0)
FROM 
(SELECT 
    (pd.AccountBranch + pd.AccountNumber + pd.AccountSuffix) AS Account
    , pd.AccountBranch
    , pd.AccountNumber
    , pd.AccountSuffix
    , pd.PrincipleAmount
FROM ADStaging..cb_account_extension_principle_dpd pd
WHERE pd.BusinessDataDate = @CurrentBusinessDataDate) C
FULL OUTER JOIN 
(SELECT 
    (pd.AccountBranch + pd.AccountNumber + pd.AccountSuffix) AS Account
    , pd.AccountBranch
    , pd.AccountNumber
    , pd.AccountSuffix
    , pd.PrincipleAmount
FROM ADStaging..cb_account_extension_principle_dpd pd
WHERE pd.BusinessDataDate = @PreviousBusinessDataDate) P
    ON P.Account = C.Account
WHERE 
    (P.PrincipleAmount IS NULL OR C.PrincipleAmount IS NULL)
    OR
    P.PrincipleAmount <> C.PrincipleAmount

但这不 - 加入组合值 - 只有当它们是单独的表时？

SELECT 
    COALESCE(c.AccountBranch, p.AccountBranch)
    , COALESCE(c.AccountNumber, p.AccountNumber)
    , COALESCE(c.AccountSuffix, p.AccountSuffix)
    , c.PrincipleAmount
    , p.PrincipleAmount
    FROM ADStaging..cb_account_extension_principle_dpd c
    FULL OUTER JOIN ADStaging..cb_account_extension_principle_dpd p
        ON (p.AccountBranch + p.AccountNumber + p.AccountSuffix)
        = (c.AccountBranch + c.AccountNumber + c.AccountSuffix)
WHERE 
    (c.BusinessDataDate = @CurrentBusinessDataDate)
    AND
    (p.BusinessDataDate = @PreviousBusinessDataDate)
4

2 回答 2

12

where 正在杀死外部连接。
一列不能同时为 null 和 = 到一个值。
将条件放入联接中。

SELECT COALESCE(c.AccountBranch, p.AccountBranch)
     , COALESCE(c.AccountNumber, p.AccountNumber)
     , COALESCE(c.AccountSuffix, p.AccountSuffix)
     , c.PrincipleAmount, p.PrincipleAmount
FROM            cb_account_extension_principle_dpd c
FULL OUTER JOIN cb_account_extension_principle_dpd p
  ON p.AccountBranch = c.AccountBranch
 AND p.AccountNumber = c.AccountNumber 
 AND p.AccountSuffix = c.AccountSuffix
 AND c.BusinessDataDate = @CurrentBusinessDataDate
 AND p.BusinessDataDate = @PreviousBusinessDataDate
于 2013-04-23T13:33:49.740 回答
0

我认为您的问题是，在第一个查询中，日期不是匹配的一部分。在您的第二个查询中，您加入的两个集合已经按日期过滤，因此它模拟了您在日期匹配时会发生的情况。假设您有两次相同的帐户分支，编号，后缀，但日期不同！这意味着完整的外部联接会找到匹配项，因为您在 ON 子句中没有日期。

试试这个：

use ADStaging;
--your dates go here:
declare @CurrentBusinessDataDate date = '2013-04-21'
, @PreviousBusinessDataDate date = '2013-04-23';
SELECT 
COALESCE(c.AccountBranch, p.AccountBranch)
, COALESCE(c.AccountNumber, p.AccountNumber)
, COALESCE(c.AccountSuffix, p.AccountSuffix)
, c.PrincipleAmount
, p.PrincipleAmount

FROM cb_account_extension_principle_dpd AS c
FULL OUTER JOIN cb_account_extension_principle_dpd AS p
    ON p.AccountBranch = c.AccountBranch
    AND p.AccountNumber = c.AccountNumber
    AND p.AccountSuffix = c.AccountSuffix
    AND p.BusinessDataDate = @PreviousBusinessDataDate
    AND c.BusinessDataDate = @CurrentBusinessDataDate;
于 2013-04-23T12:14:25.110 回答