sql - UNION查询中的“附近错误”

Question

我在SQLite中收到错误“ FROM附近的错误”，但是在此查询中找不到任何错误。我究竟做错了什么？

Select
tbltrans2_temp.itemcode,
tbltrans2_temp.itemname,
  Sum(tbltrans2_temp.qty) qty
From 
  tbltrans_temp Inner Join
  tbltrans2_temp On tbltrans2_temp.transID = tbltrans_temp.transid
 where
  tbltrans_temp.saleDate='11/07/2013'
Group By
  tbltrans2_temp.itemcode
  UNION
  Select
  tbltrans2.itemcode,
  tbltrans2.itemname,
  Sum(tbltrans2.qty) qty,
From 
  tbltrans Inner Join
  tbltrans2 On tbltrans2.transid = tbltrans.transid
   where
  tbltrans.saleDate='11/07/2013'
Group By
  tbltrans2.itemcode

Answer 1

在第二个,删除它之前，还有一个FROM：

Select
tbltrans2_temp.itemcode,
tbltrans2_temp.itemname,
  Sum(tbltrans2_temp.qty) qty
From 
  tbltrans_temp Inner Join
  tbltrans2_temp On tbltrans2_temp.transID = tbltrans_temp.transid
 where
  tbltrans_temp.saleDate='11/07/2013'
Group By
  tbltrans2_temp.itemcode
  UNION
  Select
  tbltrans2.itemcode,
  tbltrans2.itemname,
  Sum(tbltrans2.qty) qty,    <<<<-------------------  This
From 
  tbltrans Inner Join
  tbltrans2 On tbltrans2.transid = tbltrans.transid
   where
  tbltrans.saleDate='11/07/2013'
Group By
  tbltrans2.itemcode

更新资料

要从两个表中获取qty的总和，将该查询放在一个子查询中，然后在外部查询中求和，您也可以在内部查询中省略sum，而只在外部查询中执行：

SELECT 
  itemcode,
  itemname,
  SUM(qty) TotalQty
FROM
(

    Select
    tbltrans2_temp.itemcode,
    tbltrans2_temp.itemname,
      Sum(tbltrans2_temp.qty) qty
    From 
      tbltrans_temp Inner Join
      tbltrans2_temp On tbltrans2_temp.transID = tbltrans_temp.transid
     where
      tbltrans_temp.saleDate='11/07/2013'
    Group By
      tbltrans2_temp.itemcode
      UNION
      Select
      tbltrans2.itemcode,
      tbltrans2.itemname,
      Sum(tbltrans2.qty) qty
    From 
      tbltrans Inner Join
      tbltrans2 On tbltrans2.transid = tbltrans.transid
       where
      tbltrans.saleDate='11/07/2013'
    Group By
      tbltrans2.itemcode
) t
GROUP BY itemcode, itemname;