SQLite删除不起作用

Question

我有一个名为WPList的SQLite表，有4列

ID (int), ID_quote (int foreign key), ID_workperformance (int foreign key), expire_date (text)

当我尝试使用此查询消除行时，我遇到了一个大问题：

DELETE FROM WPList WHERE ID_workperformance = 12 & ID_quote = 21

我绝对确定表中存在ID_workperformance 12和ID_quote 21，但是当我执行此查询时，没有任何事情发生。你能帮我吗？谢谢！

Answer 1

它是AND，而不是&。

DELETE FROM WPList WHERE ID_workperformance = 12 AND ID_quote = 21

似乎&是等效的，但有点难以使用，因为你需要在你的案例中添加括号

DELETE FROM WPList WHERE ((ID_workperformance = 12) & (ID_quote = 21))

如果没有backet，语法的执行计划（请参阅EXPLAIN）与

相同

DELETE FROM WPList WHERE (ID_workperformance = 12 & ID_quote) = 21

解释了为什么它不能按预期工作。