MySQL查询根据条件IS NULL或！= 1 ;?显示记录
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), Score int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(Name,Score) values('John',45);
mysql> insert into DemoTable(Name,Score) values('Chris',null);
mysql> insert into DemoTable(Name,Score) values('David',null);
mysql> insert into DemoTable(Name,Score) values('Bob',1);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-
+----+-------+-------+ | Id | Name | Score | +----+-------+-------+ | 1 | John | 45 | | 2 | Chris | NULL | | 3 | David | NULL | | 4 | Bob | 1 | +----+-------+-------+ 4 rows in set (0.00 sec)
以下是根据条件ISNULL或！=1来显示记录的查询-
mysql> select *from DemoTable where Score IS NULL OR Score!=1;
这将产生以下输出-
+----+-------+-------+ | Id | Name | Score | +----+-------+-------+ | 1 | John | 45 | | 2 | Chris | NULL | | 3 | David | NULL | +----+-------+-------+ 3 rows in set (0.00 sec)