MySQL 查询从字符串中获取子字符串(仅最后三个字符)?
mysqlmysqli database更新于 2024/10/18 2:20:17
为此，您可以使用 SUBSTR() 方法。让我们首先创建一个表:
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20)); Query OK, 0 rows affected (1.31 sec)
下面是使用 insert 命令在表中插入一些记录的查询:
mysql> insert into DemoTable(FirstName) values('John');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Carol');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(FirstName) values('Robert');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(FirstName) values('David');
Query OK, 1 row affected (0.17 sec)
以下是使用 select 命令显示表中记录的查询:
mysql> select *from DemoTable;
这将产生以下输出:
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 2 | Carol | | 3 | Robert | | 4 | Chris | | 5 | David | +----+-----------+ 5 rows in set (0.00 sec)
以下是从每个字符串中获取最后三个字符的查询:
mysql> select substr(FirstName,-3) from DemoTable;
这将产生以下输出:
+----------------------+ | substr(FirstName,-3) | +----------------------+ | ohn | | rol | | ert | | ris | | vid | +----------------------+ 5 rows in set (0.00 sec)
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