##更改语句 将`张红`名字更改成`张平`。 ~~~ update user set NAME="张平" where NAME="张红"; ~~~ ##删除语句 删除指定记录 ~~~ delete from user where NAME='刘婷'; ~~~ 删除全部记录 ~~~ delete from user; ~~~ ##清空语句 ~~~ truncate user; ~~~