Question

我正在尝试使用下面的JOIN查询从2个相同的Current和Archive表中检索数据。但是，这会返回2个结果集，并且也不会返回存档表中的数据（我确定这是因为我在JOIN命令中引用了＆n;＆n; 39＆n; 39'，但我没有＆＃ 39;知道如何引用这两个表格。

我已尝试过每个查询组合，但没有成功。我做错了什么？

SELECT N.TranType,N.UserNo,N.TranCode
FROM (SELECT TranType,UserNo,TranCode FROM nTrans 
UNION ALL SELECT TranType,UserNo,TranCode FROM nTransArc) 
AS N
SELECT H.HeaderKey 
FROM (SELECT HeaderKey FROM MoveHdr
UNION ALL SELECT HeaderKey FROM MoveHdrArc) 
AS H
JOIN nTrans N ON H.HeaderKey = N.TranType + N.UserNo + N.TranCode

Answer 1

我想你想要这个：

SELECT N.TranType, N.UserNo, N.TranCode
FROM (SELECT TranType, UserNo, TranCode FROM nTrans 
      UNION ALL 
      SELECT TranType, UserNo, TranCode FROM nTransArc) AS N
JOIN (SELECT HeaderKey FROM MoveHdr
      UNION ALL
      SELECT HeaderKey FROM MoveHdrArc) AS H
ON H.HeaderKey = N.TranType + N.UserNo + N.TranCode

在JOIN查询中使用2个UNION命令

1 个答案: