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MySQL查询以使用AND OR进行选择

2024-05-15 11:36:08 424

让我们首先创建一个表-

mysql> create table DemoTable
(
   StudentId int,
   StudentName varchar(20),
   StudentSubject varchar(20)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values(10,'Chris','MongoDB');
mysql> insert into DemoTable values(11,'David','MySQL');
mysql> insert into DemoTable values(12,'Bob','Java');
mysql> insert into DemoTable values(10,'Carol','MySQL');
mysql> insert into DemoTable values(10,'Chris','MongoDB');
mysql> insert into DemoTable values(14,'David','MySQL');

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-

+-----------+-------------+----------------+
| StudentId | StudentName | StudentSubject |
+-----------+-------------+----------------+
|        10 | Chris       | MongoDB        |
|        11 | David       | MySQL          |
|        12 | Bob         | Java           |
|        10 | Carol       | MySQL          |
|        10 | Chris       | MongoDB        |
|        14 | David       | MySQL          |
+-----------+-------------+----------------+
6 rows in set (0.00 sec)

以下是使用ANDOR执行选择的查询-

mysql> select *from DemoTable where StudentName='David' and StudentSubject='MySQL' OR StudentId=11;

这将产生以下输出-

+-----------+-------------+----------------+
| StudentId | StudentName | StudentSubject |
+-----------+-------------+----------------+
|        11 | David       | MySQL          |
|        14 | David       | MySQL          |
+-----------+-------------+----------------+
2 rows in set (0.00 sec)

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MySQL查询以使用AND OR进行选择

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