MySQL的where子语句in，between的写法

1.expr1 between expr2 and expr3：表示expr1的值在expr2和expr3之间 
例子:$delete = "delete from user where id between 20 and 25";

2.expr1 in（expr2，expr3，expr4，…）表示expr1等于后面括号里面的任意一个表达式的值 
例子：$delete = "delete from user where id in(20,25,30,28)";