<b>SQL条件语句实例</b>[MSSQL防范]

在SQL语句中,SQL条件语句无疑是利用最广,最常见的SQL语句之一,下面就将为您介绍几个利用SQL条件语句,供您学习参考.

----查询StudentMarks 最大的前三条记录

select  top 3 StudentID,StudentName,Mark from StudentMarks order by Mark desc

----查询StudentMarks 的第30~40条记录

1、早年30条的背面, 取前10条

select top 10 * from StudentMarks where StudentID not in(select top 30 StudentID from StudentMarks)

2、先正序取40条, 再反序取10条

select top 10* from (select top 40* from StudentMarks order by Mark ) a
order by Mark desc

3、、操纵暂时表
select top 40 * into #Stm from StudentMarks order by Mark

select top * from #Stm  order by Mark desc

----查询和London同属于一个国家的城市的客户
select distinct * from customers where country in
( select country from customers where city='London')

----查询和London,Paris同属于一个国家的城市的客户
select * from customers where country in
(select country from Customers where City in ('London','Paris'))

----查询单价大于Dofu的产品名
select ProductName from Products where UnitPrice>
(select UnitPrice from Products where ProductName='Tofu')