如何将特定字符添加到 MySQL 表值中的任何空白处?
mysqlmysqli database
为此，使用 REPLACE() 函数并用字符替换空白处。让我们首先创建一个表 −
mysql> create table DemoTable (Subject text); Query OK, 0 rows affected (0.86 sec)
示例
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('Introduction to MySQL');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Java in depth');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values('Data Structure and Algorithm');
Query OK, 1 row affected (0.16 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
+------------------------------+ | Subject | +------------------------------+ | Introduction to MySQL | | Java in depth | | Data Structure and Algorithm | +------------------------------+ 3 rows in set (0.00 sec)
以下是替换空白处的查询 −
mysql> SELECT *,REPLACE(Subject,' ','_') as Subject_Name from DemoTable;
输出
+-------------------------------+------------------------------+ | Subject | Subject_Name | +-------------------------------+------------------------------+ | Introduction to MySQL | Introduction_to_MySQL | | Java in depth | Java_in_depth | | Data Structure and Algorithm | Data_Structure_and_Algorithm | +-------------------------------+------------------------------+ 3 rows in set (0.00 sec)
