MySQL中进行MySQL字符串操作以仅计算IP地址记录中的重复值的子部分?


对于这种字符串操作,需要使用MySQL SUBSTRING_INDEX()。首先创建一个表 −

mysql> create table DemoTable
(
   SystemIpAddress text
);
Query OK, 0 rows affected (0.58 sec)

使用insert命令在表中插入一些记录 −

mysql> insert into DemoTable values('192.168.130.67');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values('192.168.130.87');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('192.168.131.47');
Query OK, 1 row affected (0.31 sec)
mysql> insert into DemoTable values('192.168.134.50');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('192.168.131.12');
Query OK, 1 row affected (0.21 sec)

使用select语句显示表中的所有记录 −

mysql> select *from DemoTable ;

这将产生以下输出 −

+-----------------+
| SystemIpAddress |
+-----------------+
| 192.168.130.67  |
| 192.168.130.87  |
| 192.168.131.47  |
| 192.168.134.50  |
| 192.168.131.12  |
+-----------------+
5 rows in set (0.00 sec)

以下是IP地址记录中进行字符串操作的查询 −

mysql> select substring_index(tbl.SystemIpAddress, '.', 3) , count(*) as Total from DemoTable tbl
   group by substring_index(tbl.SystemIpAddress, '.', 3)
   order by Total desc limit 5;

这将产生以下输出 −

+----------------------------------------------+-------+
| substring_index(tbl.SystemIpAddress, '.', 3) | Total |
+----------------------------------------------+-------+
| 192.168.130                                  |     2 |
| 192.168.131                                  |     2 |
| 192.168.134                                  |     1 |
+----------------------------------------------+-------+
3 rows in set (0.00 sec)

更新于: 07-Oct-2019

102 个浏览量

Kickstart Your 职业生涯

完成课程即可获得认证

开始
广告