Question

如果标题没有准确描述问题（它可能没有），请道歉。我有以下两个表： -

tLiveTable：

PieceID      LocationRef
------------------------
100              5

tPieceTable：

ID    BatchNo      PieceNumber
------------------------------
50    ABC          X1
100   ABC          X1

如果只给出BatchNo和PieceNo，如何在tLiveTable中更新该部分的LocationRef？

我尝试了以下内容：

UPDATE tLiveTable
SET LocationRef = 'blabla unimportant'
WHERE
PieceID = (SELECT ID FROM tPieceTable WHERE (BatchNo = 'ABC') AND (PieceNo = 'X1'))

但是tPieceTable中可以有多个具有相同BatchNo和PieceNo的条目。我想只从tPieceTable中检索ID，其ID当前是tLiveTable中的ID。

我真的应该使用INNER JOIN吗？

Answer 1

您的查询将不 SELECT ID FROM tPieceTable WHERE (BatchNo = 'ABC') AND (PieceNo = 'X1') 返回多个ID

试试这个;

UPDATE L SET LocationRef = 'blabla unimportant'
FROM tLiveTable L JOIN tPieceTable P 
     ON L.PieceID = P.ID
WHERE (P.BatchNo = 'ABC') AND (P.PieceNo = 'X1')

或IN使用=

UPDATE tLiveTable
SET LocationRef = 'blabla unimportant'
WHERE
PieceID IN (SELECT ID FROM tPieceTable WHERE (BatchNo = 'ABC') AND (PieceNo = 'X1'))

如何在交叉引用另一个表时更新记录？

1 个答案: