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MySQL CONCAT具有特定列值和相应记录

2024-05-01 20:49:04 375

让我们首先创建一个表-

mysql> create table DemoTable
(
   FirstName varchar(100),
   CountryName varchar(100)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('Adam','US');
mysql> insert into DemoTable values('David','AUS');
mysql> insert into DemoTable values('Chris','UK');
mysql> insert into DemoTable values('John','US');
mysql> insert into DemoTable values('Carol','AUS');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+-----------+-------------+
| FirstName | CountryName |
+-----------+-------------+
| Adam      | US          |
| David     | AUS         |
| Chris     | UK          |
| John      | US          |
| Carol     | AUS         |
+-----------+-------------+
5 rows in set (0.00 sec)

以下是将特定列值与相应记录连接的查询-

mysql> select concat(FirstName,' ',CountryName) AS NameWithCountry from DemoTable
having NameWithCountry LIKE '%John%';

这将产生以下输出-

+-----------------+
| NameWithCountry |
+-----------------+
| John US         |
+-----------------+
1 row in set (0.00 sec)

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MySQL CONCAT具有特定列值和相应记录

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