MySQL 如何获得组合字段结果

您可以使用MySQL的CONCAT（）函数来实现此目的。让我们首先创建一个表 –

mysql> create table DemoTable
   (
   ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   ClientFirstName varchar(20),
   ClientLastName varchar(20)
   );
Query OK, 0 rows affected (0.50 sec)

使用插入命令在表中插入一些记录 –

mysql> insert into DemoTable(ClientFirstName,ClientLastName) values('John','Smith');
Query OK, 1 row affected (0.15 sec)

mysql> insert into DemoTable(ClientFirstName,ClientLastName) values('John','Miller');
Query OK, 1 row affected (0.12 sec)

mysql> insert into DemoTable(ClientFirstName,ClientLastName) values('Carol','Taylor');
Query OK, 1 row affected (0.13 sec)

mysql> insert into DemoTable(ClientFirstName,ClientLastName) values('Adam','Smith');
Query OK, 1 row affected (0.13 sec)

使用select语句从表中显示所有记录 –

mysql> select *from DemoTable;

这将产生以下输出 –

+----------+-----------------+----------------+
| ClientId | ClientFirstName | ClientLastName |
+----------+-----------------+----------------+
| 1        | John            | Smith          |
| 2        | John            | Miller         |
| 3        | Carol           | Taylor         |
| 4        | Adam            | Smith          |
+----------+-----------------+----------------+
4 rows in set (0.00 sec)

以下是获取组合字段结果的查询 –

mysql> select ClientId from DemoTable where concat(ClientFirstName,' ',ClientLastName) LIKE 'Jo%';

这将产生以下输出 –

+----------+
| ClientId |
+----------+
| 1        |
| 2        |
+----------+
2 rows in set (0.00 sec)

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