在MySQL SELECT子句中添加/连接文本值？
要在select子句中添加/连接文本值，可以使用concat()函数。
让我们创建一个表
mysql> create table ConcatenatingDemo-> (
-> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> UserName varchar(20),
-> UserCountryName varchar(20)
-> );
现在，您可以使用insert命令在表中插入一些记录。查询如下-
mysql> insert into ConcatenatingDemo(UserName,UserCountryName) values('John','US');mysql> insert into ConcatenatingDemo(UserName,UserCountryName) values('Carol','UK');
mysql> insert into ConcatenatingDemo(UserName,UserCountryName) values('Bob','AUS');
mysql> insert into ConcatenatingDemo(UserName,UserCountryName) values('David','US');
使用select语句显示表中的所有记录。查询如下-
mysql> select *from ConcatenatingDemo;
以下是输出
+--------+----------+-----------------+| UserId | UserName | UserCountryName |
+--------+----------+-----------------+
| 1 | John | US |
| 2 | Carol | UK |
| 3 | Bob | AUS |
| 4 | David | US |
+--------+----------+-----------------+
4 rows in set (0.00 sec)
这是用于在SELECT子句中添加/连接文本值的查询
mysql> select concat(UserName,' belongs to ( ',UserCountryName,' )') as AddingTextDemo from ConcatenatingDemo;
以下是输出
+-------------------------+| AddingTextDemo |
+-------------------------+
| John belongs to ( US ) |
| Carol belongs to ( UK ) |
| Bob belongs to ( AUS ) |
| David belongs to ( US ) |
+-------------------------+
4 rows in set (0.00 sec)
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