使用 MySQL 获取字段值并将其中的特定字符转换为大写
mysqlmysqli database
首先我们创建一个表 −
mysql> create table DemoTable1897 ( Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1897 values('john');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1897 values('Chris');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1897 values('jace');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1897 values('David');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1897 values('Chris');
Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1897;
这将产生以下输出 −
+-------+ | Name | +-------+ | john | | Chris | | jace | | David | | Chris | +-------+ 5 rows in set (0.00 sec)
这是获取字段值并将特定字符转换为大写的查询
mysql> select replace(Name,'j','J') from DemoTable1897;
这将产生以下输出 −
+-----------------------+ | replace(Name,'j','J') | +-----------------------+ | John | | Chris | | Jace | | David | | Chris | +-----------------------+ 5 rows in set (0.00 sec)
