如何从匹配字符串的表中删除？

Question

我想删除my_table WHERE电子邮件在文本中不包含“gmail”。

我该如何匹配？

Answer 1

使用INSTR()

DELETE FROM my_table
WHERE instr(`email`, 'gmail') = 0

SQLFiddle demo

Answer 2

你可以使用'NOT LIKE'如下：

    DELETE FROM my_table WHERE email NOT LIKE '%gmail%'

Answer 3

DELETE FROM my_table WHERE email NOT REGEXP'gmail'