使用 OR 子句在 WHERE 语句中显示列及其值的 MySQL 查询
我们先创建一张表 -
mysql> create table DemoTable777 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), StudentAge int ); Query OK, 0 rows affected (1.34 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable777(StudentName,StudentAge) values('Chris',23);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable777(StudentName,StudentAge) values('Robert',21);
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable777(StudentName,StudentAge) values('Mike',19);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable777(StudentName,StudentAge) values('Bob',22);
Query OK, 1 row affected (0.19 sec)使用 select 语句从表中显示所有记录 -
mysql> select *from DemoTable777;
这将会输出以下内容 -
+-----------+-------------+------------+ | StudentId | StudentName | StudentAge | +-----------+-------------+------------+ | 1 | Chris | 23 | | 2 | Robert | 21 | | 3 | Mike | 19 | | 4 | Bob | 22 | +-----------+-------------+------------+ 4 rows in set (0.00 sec)
以下是使用 OR 子句在 WHERE 语句中返回所有列的查询 -
mysql> select *from DemoTable777 where StudentId IN(1,2) OR StudentName='Mike' OR StudentAge=22;
这将会输出以下内容 -
+-----------+-------------+------------+ | StudentId | StudentName | StudentAge | +-----------+-------------+------------+ | 1 | Chris | 23 | | 2 | Robert | 21 | | 3 | Mike | 19 | | 4 | Bob | 22 | +-----------+-------------+------------+ 4 rows in set (0.00 sec)
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