Question

我想使用此查询中的值进行更新，但它会说它返回多个值。

UPDATE PO_HEADER
  SET TOTAL = (SELECT SUM(LINE_TOTAL) AS "NEW_LINE_TOTAL" 
  FROM PO_LINE pl, PO_HEADER ph 
  where ph.IC_PO_HEADER = pl.IC_PO_HEADER 
  and ph.RELEASE_NUMBER = pl.RELEASE_NUMBER 
  group by pl.IC_PO_HEADER,pl.FOREIGN_KEY,ph.RELEASE_NUMBER,
  ph.REVISION_NUMBER,ph.PO_NUMBER)
from PO_HEADER ph, PO_LINE pl
where ph.IC_PO_HEADER = pl.IC_PO_HEADER;

Msg 512，Level 16，State 1，Line 1
子查询返回的值超过1。当子查询遵循=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或子查询用作表达式时，不允许这样做。

它如何返回多个列？

Answer 1

如果此查询返回您想要的信息：

SELECT *, LINE_TOTAL = SUM(l.LINE_TOTAL) OVER 
    (PARTITION BY l.IC_PO_HEADER, l.RELEASE_NUMBER)
  FROM dbo.PO_HEADER AS h
  INNER JOIN dbo.PO_LINE AS l
  ON h.IC_PO_HEADER = l.IC_PO_HEADER 
  AND h.RELEASE_NUMBER = l.RELEASE_NUMBER;

然后这可能是您想要的UPDATE查询：

;WITH x AS
(
  SELECT h.TOTAL, lt = SUM(l.LINE_TOTAL) OVER 
    (PARTITION BY l.IC_PO_HEADER, l.RELEASE_NUMBER)
  FROM dbo.PO_HEADER AS h
  INNER JOIN dbo.PO_LINE AS l
  ON h.IC_PO_HEADER = l.IC_PO_HEADER 
  AND h.RELEASE_NUMBER = l.RELEASE_NUMBER
)
UPDATE x SET TOTAL = lt;

我必须同意戈登，你的分组似乎很奇怪。我不确定我是否做对了（这就是我强烈建议你先运行SELECT的原因。）

Answer 2

它返回多个列，因为子查询select返回多行。

也许你的意思是这样的：

with toupdate as (
     SELECT SUM(LINE_TOTAL) AS "NEW_LINE_TOTAL" 
     FROM PO_LINE pl join
          PO_HEADER ph 
          on ph.IC_PO_HEADER = pl.IC_PO_HEADER and
             ph.RELEASE_NUMBER = pl.RELEASE_NUMBER 
     group by pl.IC_PO_HEADER, pl.FOREIGN_KEY, ph.RELEASE_NUMBER,
              ph.REVISION_NUMBER, ph.PO_NUMBER
    )
UPDATE PO_HEADER
    SET TOTAL = toupdate. New_Line_Total
    from toupdate
    where PO_HEADER.IC_PO_HEADER = toupdate.IC_PO_HEADER;

但是，我仍然怀疑这一点，因为你在子查询中按5个字段进行分组，但只加入其中一个字段。在这种情况下，我希望“toupdate”只能在ic_po_header上进行分组。

使用SUM和Group BY进行T-SQL更新

2 个答案: