MySQL如何要删除一个一行或者多行，用sql语句delete关键词，固定用法 delete from 表名。

    1，delete删除一行

        delete from student where id=1

    2，delete删除多行

       delete from student where in (1,2,3)

3，删除表的所有数据

   delete from student

     请使用不带where子句的delete语句

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