获取子字符串(只从字符串中获取最后三个字符)的 MySQL 查询?


为此,你可以使用 SUBSTR() 方法。我们先创建一个表格

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 命令在表格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)

下面是使用 select 命令从表格中显示记录的查询

mysql> select *from DemoTable;

这将会产生以下输出

+----+-----------+
| Id | FirstName |
+----+-----------+
|  1 | John      |
|  2 | Carol     |
|  3 | Robert    |
|  4 | Chris     |
|  5 | David     |
+----+-----------+
5 rows in set (0.00 sec)

以下是获取每个字符串中最后三个字符的查询

mysql> select substr(FirstName,-3) from DemoTable;

这将会产生以下输出

+----------------------+
| substr(FirstName,-3) |
+----------------------+
| ohn                  |
| rol                  |
| ert                  |
| ris                  |
| vid                  |
+----------------------+
5 rows in set (0.00 sec)

更新于: 2019-07-30

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