MySQL查询从表中查找替代记录
要从表中查找替代记录，您需要使用OR条件，如以下语法所示：
select *from yourTableName where yourColumnName=yourValue1 OR yourColumnName=yourValue2…...N;
让我们首先创建一个表-
mysql> create table DemoTable772 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(100), Age int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable772(Name,Age) values('Chris',21);
mysql> insert into DemoTable772(Name,Age) values('Robert',26);
mysql> insert into DemoTable772(Name,Age) values('Mike',27);
mysql> insert into DemoTable772(Name,Age) values('Sam',24);
mysql> insert into DemoTable772(Name,Age) values('Carol',28);
mysql> insert into DemoTable772(Name,Age) values('David',25);使用select语句显示表中的所有记录-
mysql> select *from DemoTable772;
这将产生以下输出-
+----+--------+------+ | Id | Name | Age | +----+--------+------+ | 1 | Chris | 21 | | 2 | Robert | 26 | | 3 | Mike | 27 | | 4 | Sam | 24 | | 5 | Carol | 28 | | 6 | David | 25 | +----+--------+------+ 6 rows in set (0.00 sec)
这是MySQL的查询OR-
mysql> select *from DemoTable772 where Id=2 OR Id=4 OR Id=6;
这将产生以下输出-
+----+--------+------+ | Id | Name | Age | +----+--------+------+ | 2 | Robert | 26 | | 4 | Sam | 24 | | 6 | David | 25 | +----+--------+------+ 3 rows in set (0.01 sec)