mysql - 连接 2 个不相等的 sql 查询

Question

我有 2 个选择查询，我想将它们合并成一个不重复的查询。另外，我想使用所有表中找到的 shiftindex 主键加入它们。我该怎么做？

第一个选择语句是:

SELECT     dbo.hist_exproot.year, 
           dbo.hist_exproot.[month#], 
           dbo.hist_exproot.month, 
           dbo.hist_exproot.day, 
           dbo.hist_exproot.[shift#], 
           dbo.hist_exproot.shift, 
           dbo.hist_loads.excav, 
           SUM(dbo.hist_loads.loadtons) AS 'TONS', 
           SUM(dbo.hist_loads.ex_tmcat00)/3600 AS 'TTOTAL', 
           SUM(dbo.hist_loads.ex_tmcat01+dbo.hist_loads.ex_tmcat02)/3600 AS 'T_EFECT'
FROM       dbo.hist_exproot 
INNER JOIN dbo.hist_loads 
           ON dbo.hist_exproot.shiftindex = dbo.hist_loads.shiftindex
WHERE     (dbo.hist_exproot.year >= 16)
GROUP BY  dbo.hist_exproot.year, 
          dbo.hist_exproot.[month#], 
          dbo.hist_exproot.month, 
          dbo.hist_exproot.day, 
          dbo.hist_exproot.[shift#], 
          dbo.hist_exproot.shift, 
          dbo.hist_loads.excav

第二个是:

SELECT     dbo.hist_exproot.year,
           dbo.hist_exproot.[month#], 
           dbo.hist_exproot.shiftdate, 
           dbo.hist_exproot.shift, 
           dbo.hist_statusevents.eqmt, 
           dbo.hist_exproot.crew, 
           dbo.hist_reasontable.category, 
           dbo.hist_statusevents.reason, 
           dbo.hist_reasontable.name, 
           dbo.hist_operlist.operid, 
           dbo.hist_statusevents.starttime, 
           dbo.hist_statusevents.endtime, 
           dbo.hist_statusevents.duration/3600 as 'Time', 
           dbo.hist_statusevents.comment
FROM       dbo.hist_reasontable 
INNER JOIN dbo.hist_statusevents 
           ON dbo.hist_reasontable.shiftindex = dbo.hist_statusevents.shiftindex 
           AND dbo.hist_reasontable.reason = dbo.hist_statusevents.reason 
INNER JOIN dbo.hist_operlist 
           ON dbo.hist_statusevents.operid = dbo.hist_operlist.operid 
           AND dbo.hist_statusevents.shiftindex = dbo.hist_operlist.shiftindex 
           AND dbo.hist_reasontable.shiftindex = dbo.hist_operlist.shiftindex 
INNER JOIN dbo.hist_exproot 
           ON dbo.hist_statusevents.shiftindex = dbo.hist_exproot.shiftindex
WHERE      
           (dbo.hist_exproot.year >= 16) 
            AND (dbo.hist_statusevents.unit = 2) 
            AND(dbo.hist_statusevents.eqmt <> 'L98') 
            AND (dbo.hist_statusevents.eqmt <> 'L96')
            AND  (dbo.hist_statusevents.eqmt <> 'L09')
            AND (dbo.hist_statusevents.eqmt <> 'S47')
ORDER BY dbo.hist_exproot.shiftdate, 
         dbo.hist_statusevents.eqmt

如果您有疑问，请告诉我。

谢谢

Answer 1

实现您要求的最简单方法是:

SELECT DISTINCT *
FROM (Query 1) JOIN
(Query 2) ON...

这两个子查询的连接将由 on 后面的内容来处理，distinct 将消除所有重复项。