子查询以排除MySQL中的特定行
让我们首先创建一个表-
mysql> create table DemoTable -> ( -> 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 DemoTable(Name,Age) values('John',21);
mysql> insert into DemoTable(Name,Age) values('Carol',22);
mysql> insert into DemoTable(Name,Age) values('David',23);使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
这将产生以下输出-
+----+-------+------+ | Id | Name | Age | +----+-------+------+ | 1 | John | 21 | | 2 | Carol | 22 | | 3 | David | 23 | +----+-------+------+ 3 rows in set (0.00 sec)
这是排除特定行的子查询，名称为Carol-
mysql> select *from DemoTable -> where Name not in (select Name from DemoTable where Name='Carol' -> );
输出结果
这将产生以下输出-
+----+-------+------+ | Id | Name | Age | +----+-------+------+ | 1 | John | 21 | | 3 | David | 23 | +----+-------+------+ 2 rows in set (0.00 sec)