我执行删除查询时收到错误

Question

我正在执行以下查询

DELETE FROM List,Tree WHERE List.CatID = Tree.CatID AND List.ID = '1' AND Tree.Cat = '332'

但我遇到了以下错误

near ",": syntax error

Answer 1

删除语句的正确语法是这个

DELETE FROM table_name WHERE somecolumn=somevalue

因此，您不能在单个删除查询中使用2个表，只需用逗号分隔它们。

您需要执行类似

的操作

DELETE something FROM table_name INNER JOIN...

Answer 2

您一次只能从一个表中删除，并且必须将连接重写为子查询：

DELETE FROM List
WHERE ID = '1'
  AND CatID IN (SELECT CatID
                FROM Tree
                WHERE Cat = '332')