SQL查询以连接具有不同列数的两个不同查询答案

【问题标题】：SQL query to join two different queries with different number of columnsSQL查询以连接具有不同列数的两个不同查询
【发布时间】：2018-03-28 08:00:46
【问题描述】：

我有两个问题：

查询 1：

SELECT allowdeductname_en, SUM(SFD_comp_value_tax@;emp_id) as                                                                                                                                      
GGG                                                                                                                                                                                                 
FROM TPYDPROCMTDD md                                                                                       
LEFT JOIN TPYDPROCMTDH mh on md.procmtdh_id = mh.procmtdh_id and 
md.company_id = mh.company_id                                                                                                                                                                                                                                                    
WHERE md.allowdeducttype = 'A'                                                                                                                                                                                                                                                     
AND md.company_id = '13565'
AND mh.company_id = '13565'
AND year(mh.paydate) = 2017                                                           
AND month(mh.paydate) = 1 
AND mh.costcenter_code = 99990001
group by allowdeductname_en
order by allowdeductname_en

查询 2：

SELECT distinct allowdeductname_en                                                                                                                                                                                              
FROM TPYDPROCMTDD md                                                                                       
LEFT JOIN TPYDPROCMTDH mh on md.procmtdh_id = mh.procmtdh_id and 
md.company_id = mh.company_id                                                                                                                                                                                                                                                    
WHERE md.allowdeducttype = 'A'                                                                                                                                                                                                                                                     
AND md.company_id = '13565'
AND mh.company_id = '13565'
AND year(mh.paydate) = 2017                                                           
AND month(mh.paydate) = 1
order by allowdeductname_en

查询 1 和查询 2 的结果：

我是否可以将这两个查询相交、连接或联合，使其看起来像这样：

预期结果：

我尝试了很多不同的方法，但仍然无法获得我想要的结果。伙计们请帮忙！

【问题讨论】：

编辑您的问题并将示例数据和所需结果作为文本放入问题中。
只需添加一个额外的列：cast(null as int) as ggg
轻松为您提供帮助。保持列名和数据简短易读，即使我们不会说您的语言。
您可以简单地将查询 1 外连接到查询 2。但是，您的查询没有正确编写。例如，您的外部联接不起作用（也许它们甚至不应该起作用）。我想你可以写一个更简单的查询。 allowdeductname_en 驻留在哪个表中？而SUM(SFD_comp_value_tax@;emp_id) 可能是一个错字。你能纠正一下吗？

标签： sql sql-server database

【解决方案1】：

嗯，这是最直接的解决方案：

select * from (/*query number 2*/) [a]
left join (/*query number 1*/) [b] 
on [a].allowdeductname_en = [b].allowdeductname_en

但是您可以在一个查询中完成它，因为两个查询都使用同一个表，但是为了提供该解决方案，我需要查看您的数据。

【讨论】：

【解决方案2】：

select t2.allowdeductname_en, GGG=isnull(t1.GGG,0)
 from 
(SELECT distinct allowdeductname_en                                                                                                                                                                                              
FROM TPYDPROCMTDD md                                                                                       
LEFT JOIN TPYDPROCMTDH mh on md.procmtdh_id = mh.procmtdh_id and 
md.company_id = mh.company_id                                                                                                                                                                                                                                                    
WHERE md.allowdeducttype = 'A'                                                                                                                                                                                                                                                     
AND md.company_id = '13565'
AND mh.company_id = '13565'
AND year(mh.paydate) = 2017                                                           
AND month(mh.paydate) = 1 ) t2

LEFT JOIN 

(SELECT allowdeductname_en, SUM(SFD_comp_value_tax@;emp_id) as                                                                                                                                      
GGG                                                                                                                                                                                                 
FROM TPYDPROCMTDD md                                                                                       
LEFT JOIN TPYDPROCMTDH mh on md.procmtdh_id = mh.procmtdh_id and 
md.company_id = mh.company_id                                                                                                                                                                                                                                                    
WHERE md.allowdeducttype = 'A'                                                                                                                                                                                                                                                     
AND md.company_id = '13565'
AND mh.company_id = '13565'
AND year(mh.paydate) = 2017                                                           
AND month(mh.paydate) = 1 
AND mh.costcenter_code = 99990001
group by allowdeductname_en)  t1 on t2.allowdeductname_en=t1.allowdeductname_en


this is not the best query but it give you the result you want.

【讨论】：

你是个天才。谢谢您的帮助。干杯！

【解决方案3】：

您可以在两者之间使用LEFT JOIN 和ISNULL：

;WITH FirstQuery AS
(
    SELECT 
        allowdeductname_en, 
        SUM(SFD_comp_value_tax@;emp_id) as    GGG                                                                                                                                                                                                 
    FROM TPYDPROCMTDD md                                                                                       
    LEFT JOIN TPYDPROCMTDH mh on md.procmtdh_id = mh.procmtdh_id and 
    md.company_id = mh.company_id                                                                                                                                                                                                                                                    
    WHERE md.allowdeducttype = 'A'                                                                                                                                                                                                                                                     
    AND md.company_id = '13565'
    AND mh.company_id = '13565'
    AND year(mh.paydate) = 2017                                                           
    AND month(mh.paydate) = 1 
    AND mh.costcenter_code = 99990001
    group by allowdeductname_en
),
SecondQuery AS
(
    SELECT distinct allowdeductname_en                                                                                                                                                                                              
    FROM TPYDPROCMTDD md                                                                                       
    LEFT JOIN TPYDPROCMTDH mh on md.procmtdh_id = mh.procmtdh_id and 
    md.company_id = mh.company_id                                                                                                                                                                                                                                                    
    WHERE md.allowdeducttype = 'A'                                                                                                                                                                                                                                                     
    AND md.company_id = '13565'
    AND mh.company_id = '13565'
    AND year(mh.paydate) = 2017                                                           
    AND month(mh.paydate) = 1
)
SELECT
    S.allowdeductname_en,
    ISNULL(N.GGG, 0) AS GGG
FROM
    SecondQuery AS S
    LEFT JOIN FirstQuery AS N ON S.allowdeductname_en = N.allowdeductname_en

【讨论】：

【解决方案4】：

查询仅在条件costcenter_code = 99990001 上有所不同。将此移动到您的聚合函数SUM：

select allowdeductname_en,
  sum(case when mh.costcenter_code = 99990001 then sfd_comp_value_tax end) as ggg
from tpydprocmtdd md
left join tpydprocmtdh mh on md.procmtdh_id = mh.procmtdh_id
                          and md.company_id = mh.company_id
                          and year(mh.paydate) = 2017
                          and month(mh.paydate) = 1
where md.allowdeducttype = 'A'
and md.company_id = 13565
group by allowdeductname_en
order by allowdeductname_en;

【讨论】：