SQLite 更新查询 - 带有别名的子查询不起作用

Question

我需要更新一个 SQLite 表。

表格看起来像:

ID   | Address            | CallNumber   |  RefID
-----+--------------------+-------------------------------------------
ef78 | library            | 2002/13      | 100002
no56 | Lit                | 0189         | 100003
rs90 | temp               |              | 100003

对于 Address = "Lit"的每一列，都有一列 Address = 'temp' 具有相同的 RefID。现在我需要用具有相同 RefID 的列中的值“CallNumber”更新每个 Address =“temp”。

更新后的表格应该如下所示:

ID   | Address            | CallNumber   |  RefID
-----+--------------------+-------------------------------------------
ef78 | library            | 2002/13      | 100002
no56 | Lit                | 0189         | 100003
rs90 | 0189               |              | 100003

我试过这个:

UPDATE Location
SET address = foo.callnumber
FROM (select RefID, CallNumber FROM Location) foo
WHERE foo.RefID=Location.RefID AND Location.Address = 'temp';

但我得到的只是“from”附近的语法错误。

有什么线索吗？

Answer 1

UPDATE 命令 do not have a FROM clause .

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'