使用REGEXP仅返回数字行。让我们首先创建一个表-
mysql> create table DemoTable -> ( -> StudentId varchar(100) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('John74747'); mysql> insert into DemoTable values('8494575Carol'); mysql> insert into DemoTable values('985755645'); mysql> insert into DemoTable values('Carol-9032'); mysql> insert into DemoTable values('101');
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
+--------------+ | StudentId | +--------------+ | John74747 | | 8494575Carol | | 985755645 | | Carol-9032 | | 101 | +--------------+ 5 rows in set (0.00 sec)
以下是仅返回数字行的查询-
mysql> select *from DemoTable where StudentId REGEXP '^[0-9]+$';
输出结果
+-----------+ | StudentId | +-----------+ | 985755645 | | 101 | +-----------+ 2 rows in set (0.17 sec)