如何将包含多列的结果拆分为每行两行

Question

我正试图将我的输出分成两行，而不是一行。我最终想通过循环这些返回中的每一个来进行插入，但一步一个步骤。

select m6.mrid
    ,'6' as 'FromProj'
    ,m10.mrid
    ,'10' as 'ToProj'
from master6 m6
left join master10 m10
    on (m01.mrtitle like '%40[%] load%' and m6.mrtitle like '%40[%] load%')
        or ((m6.mrtitle like '%ie11 know%' or m6.mrtitle like '%ie11 kr%') and m10.mrtitle like '%ie11 kr%')
        or (m6.mrtitle like '%survey issue%' and m10.mrtitle like '%survey issue%')
        or (m6.mrtitle like '%binary script%' and m10.mrtitle like '%binary script%')
        or (m6.mrtitle like '%zoom issue%' and m10.mrtitle like '%zoom issue%')
        or (m6.mrtitle like '%auto%submit%' and m10.mrtitle like '%auto%submit%')
where m10.mrtitle is not null

结果：

mrid   FromProj   mrid   ToProj
21     6          666    10
23     6          666    10
343    6          554    10
3432   6          222    10
5432   6          222    10

期望结果：

mrid   FromProj
21     6 
666    10
23     6 
666    10
343    6 
554    10
3432   6 
222    10
5432   6 
222    10

Answer 1

您可以将当前结果CROSS JOIN转换为'6'和'10'的行表示，以获得行重复，然后使用CASE...WHEN:筛选出适当的mrid（m6或m10）

编辑

为了保持原始值的交错顺序，将原始查询移动到派生表或CTE中，并为每个投影行分配一个递增计数器（在交叉连接之前）。我使用了ROW_NUMBER()，但您也可以使用序列。

SELECT CASE WHEN x.FromProj = '6'
            THEN y.m6rid 
            ELSE y.m10mrid 
       END AS mrid,
       x.FromProj
from 
(SELECT m10.mrid as m10mrid, m6.mrid AS m6mrid, 
        ROW_NUMBER() OVER (ORDER BY m6.mrid ASC) AS rowOrder
 FROM master6 m6
  left join master10 m10
    on (m01.mrtitle like '%40[%] load%' and m6.mrtitle like '%40[%] load%')
        or ((m6.mrtitle like '%ie11 know%' or m6.mrtitle like '%ie11 kr%')
             and m10.mrtitle like '%ie11 kr%')
        or (m6.mrtitle like '%survey issue%' and m10.mrtitle like '%survey issue%')
        or (m6.mrtitle like '%binary script%' and m10.mrtitle like '%binary script%')
        or (m6.mrtitle like '%zoom issue%' and m10.mrtitle like '%zoom issue%')
        or (m6.mrtitle like '%auto%submit%' and m10.mrtitle like '%auto%submit%')
    where m10.mrtitle is not null
 ) y
cross join 
(select '6' as FromProj
 UNION
 select '10') x
ORDER BY rowOrder ASC, FromProj ASC; -- Since you want 6 before 10

Answer 2

如果您使用的是2005+，则可以使用CROSS APPLY来取消浏览此

SELECT ca.mrid,
       ca.FromProj
FROM   master6 m6
       INNER JOIN master10 m10
         ON ( m01.mrtitle LIKE '%40[%] load%'
              AND m6.mrtitle LIKE '%40[%] load%' )
             OR ( ( m6.mrtitle LIKE '%ie11 know%'
                     OR m6.mrtitle LIKE '%ie11 kr%' )
                  AND m10.mrtitle LIKE '%ie11 kr%' )
             OR ( m6.mrtitle LIKE '%survey issue%'
                  AND m10.mrtitle LIKE '%survey issue%' )
             OR ( m6.mrtitle LIKE '%binary script%'
                  AND m10.mrtitle LIKE '%binary script%' )
             OR ( m6.mrtitle LIKE '%zoom issue%'
                  AND m10.mrtitle LIKE '%zoom issue%' )
             OR ( m6.mrtitle LIKE '%auto%submit%'
                  AND m10.mrtitle LIKE '%auto%submit%' )
       CROSS APPLY (SELECT m6.mrid,
                           6
                    UNION ALL
                    SELECT m10.mrid,
                           10) ca(mrid, FromProj)
WHERE  m10.mrtitle IS NOT NULL
ORDER  BY mrid,
          FromProj