Question

编辑：使查询更简单，同样的问题。

我基本上有两个陈述，用于选择是否使用给定的帐户ID和提交期限来死亡。

当输入具有联名账户持有人的账户时，两个查询（pr和jo）都会返回值以及case语句中显示的正确指标。

当第二个查询没有返回任何值时（因为没有联合帐户持有人被指示为活着或已经死亡），那么case语句似乎不起作用并且不返回任何值。

为什么会发生这种情况，即使第二个表不返回值，如何让case语句仍返回值？

谢谢！

SELECT 
CASE
            WHEN    pr.fintPriDeceased=0 and (jo.fintJointDeceased=0 or jo.fintJointDeceased='')
            THEN    0
            ELSE    1
            END AS fintDeceased
FROM

(SELECT a.FLNGCUSTOMERKEY as flngPrimaryCustomerKey,
        a.flngAccountKey as flngPrimaryAccountKey,
        CASE
            WHEN ci.fdtmCease<>'12-31-9999' 
            THEN    1
            ELSE    0
            END AS fintPriDeceased
FROM    tblAccount a,
        tblPeriod p,
        tblCustomerInfo ci
WHERE   a.flngAccountKey    = @plngAccountKey and
        p.fdtmFilingPeriod  = @pdtmFilingPeriod and
        a.flngAccountKey    = p.flngAccountKey and
        a.FLNGCUSTOMERKEY   = ci.flngCustomerKey) pr

(SELECT a.FLNGCUSTOMERKEY as flngJointCustomerKey,
        p.FLNGACCOUNTKEY as flngJointAccountKey,
        CASE
            WHEN ci.fdtmCease<>'12-31-9999' 
            THEN    1
            ELSE    0
            END AS fintJointDeceased
FROM    tblAccount a,
        tblPeriod p,
        tblCustomerInfo ci
WHERE   p.FLNGJOINTACCOUNTKEY   = @plngAccountKey and
        p.fdtmFilingPeriod      = @pdtmFilingPeriod and
        a.flngAccountKey        = p.flngAccountKey and
        a.FLNGCUSTOMERKEY       = ci.flngCustomerKey) jo

Answer 1

由于你的上一条评论说“pr总是被填充。jo有时候不是”...... 这意味着你需要在{2}之间LEFT OUTER JOIN（可选的连接）... 这需要明确你的JOIN：你必须有一个ON子句，确切地说明哪些列被等同/比较。

然后，您还需要在CASE语句中检查IS NULL，因为没有找到联合帐户。

SELECT 
CASE
            WHEN    pr.fintPriDeceased=0 
            and     (jo.fintJointDeceased IS NULL 
                    OR jo.fintJointDeceased=0)
            THEN    0
            ELSE    1
            END AS fintDeceased

FROM
(SELECT a.FLNGCUSTOMERKEY as flngPrimaryCustomerKey,
        a.flngAccountKey as flngPrimaryAccountKey,
        CASE
            WHEN ci.fdtmCease<>'12-31-9999' 
            THEN    1
            ELSE    0
            END AS fintPriDeceased
FROM    tblAccount a,
        tblPeriod p,
        tblCustomerInfo ci
WHERE   a.flngAccountKey    = @plngAccountKey and
        p.fdtmFilingPeriod  = @pdtmFilingPeriod and
        a.flngAccountKey    = p.flngAccountKey and
        a.FLNGCUSTOMERKEY   = ci.flngCustomerKey) pr

LEFT OUTER JOIN 
(SELECT a.FLNGCUSTOMERKEY as flngJointCustomerKey,
        p.FLNGACCOUNTKEY as flngJointAccountKey,
        CASE
            WHEN ci.fdtmCease<>'12-31-9999' 
            THEN    1
            ELSE    0
            END AS fintJointDeceased
FROM    tblAccount a,
        tblPeriod p,
        tblCustomerInfo ci
WHERE   p.FLNGJOINTACCOUNTKEY   = @plngAccountKey and
        p.fdtmFilingPeriod      = @pdtmFilingPeriod and
        a.flngAccountKey        = p.flngAccountKey and
        a.FLNGCUSTOMERKEY       = ci.flngCustomerKey) jo
ON pr.flngPrimaryCustomerKey = jo.flngJointCustomerKey
AND pr.flngPrimaryAccountKey = jo.flngJointAccountKey

（您可能需要更改此ON子句，位于左上方的LEFT OUTER JOIN的底部...我不知道您的customerkey和accountkey在2个SELECT之间是否通常匹配。）< / p>

希望有所帮助！

使用变量无效的案例陈述

1 个答案: