本文介绍了SQLite更新查询-具有别名的子查询不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要更新一个SQLite表。
I need to update a SQLite table.
表格如下:
ID | Address | CallNumber | RefID -----+--------------------+------------------------------------------- ef78 | library | 2002/13 | 100002 no56 | Lit | 0189 | 100003 rs90 | temp | | 100003对于地址= Lit的每一列,都有地址='temp'的列相同的RefID。 现在,我需要使用相同的RefID从列中使用值 CallNumber更新每个Address = temp。
For every column with Address = "Lit" there is a column Address = 'temp' with the same RefID. Now I need to update each Address = "temp" with the value "CallNumber" from the column with the same RefID.
更新后的表应类似于:
ID | Address | CallNumber | RefID -----+--------------------+------------------------------------------- ef78 | library | 2002/13 | 100002 no56 | Lit | 0189 | 100003 rs90 | 0189 | | 100003我尝试了此操作:
UPDATE Location SET address = foo.callnumber FROM (select RefID, CallNumber FROM Location) foo WHERE foo.RefID=Location.RefID AND Location.Address = 'temp';但是我所得到的只是 from附近的语法错误。
But all I got is a syntax error near "from".
任何线索?
推荐答案UPDATE 命令没有 FROM 子句。
使用相关子查询:
UPDATE Location SET Address = (SELECT CallNumber FROM Location L2 WHERE L2.RefID = Location.RefID AND L2.Address = 'Lit') WHERE Address = 'temp'更多推荐
SQLite更新查询
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