SQL 条件语句（练习总结）

----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、从前30条的后面, 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、、利用临时表
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')