MySQL 如何选择行，当列必须满足多个值

为此，您可以使用GROUP BY HAVING子句以及IN()。让我们首先创建一个表 –

mysql> create table DemoTable1885
   (
   FirstName varchar(20),
   Subject varchar(50)
   );
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 DemoTable1885 values('John','MySQL');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1885 values('John','MongoDB');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1885 values('Carol','MySQL');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1885 values('David','Java');
Query OK, 1 row affected (0.00 sec)

使用insert命令显示表中的一些记录 –

mysql> select * from DemoTable1885;

这将生成以下输出 –

+-----------+---------+
| FirstName | Subject |
+-----------+---------+
| John      |    MySQL|
| John      |  MongoDB|
| Carol     |    MySQL|
| David     |    Java |
+-----------+---------+
4 rows in set (0.00 sec)

以下是选择行时列必须满足多个值的查询：

mysql> select FirstName from DemoTable1885
   where Subject IN('MySQL','MongoDB')
   group by FirstName
   having count(*)=2;

这将生成以下输出 –

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

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