3.2w+
社区成员
- 主页
- 基础类
- 应用实例
- 新技术前沿
SQL语句的简单问题
有表
id scale
1 5
2 6
3 4
4
5 7
6 4
7
8 12
9 7
select top 4 * from table order by abs(scale-8)
执行后为什么是7，4，9，5行？如何才能不包括4，7行？
4，7行的scale是NULL
id scale
1 5
2 6
3 4
4
5 7
6 4
7
8 12
9 7
select top 4 * from table order by abs(scale-8)
执行后为什么是7，4，9，5行？如何才能不包括4，7行？
4，7行的scale是NULL
...全文
请发表友善的回复…
发表回复
shenanigan 2003-12-23
select top 4 * from table where scale is not null order by abs(scale-8)
这句正确
这句正确
gmlxf 2003-12-23
刚才写错了是：
select top 4 * from table where scale is not null order by abs(scale-8)
select top 4 * from table where scale is not null order by abs(scale-8)
DigJim 2003-12-23
或者
select top 4 * from table order by abs(scale-8) where ISNULL(scale ,'') <> ''
select top 4 * from table order by abs(scale-8) where ISNULL(scale ,'') <> ''
ba_saner 2003-12-23
select top 4 * from table order by abs(scale-8) where scale is not null
select top 4 * from table where scale is not null order by abs(scale-8)
以上两个句子那个正确？
select top 4 * from table where scale is not null order by abs(scale-8)
以上两个句子那个正确？
gmlxf 2003-12-23
sql中是用
where col1 is null
来判断
不能是
where col1=null
where col1 is null
来判断
不能是
where col1=null
gmlxf 2003-12-23
select top 4 * from table order by abs(scale-8) where scale is not null