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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