学习Microsoft SQL Server 2008技术内幕：T-SQL语法基础--第4章

第4章 子查询

4.2.1 Exist 谓语：

use TSQLFundamentals2008
select * 
from Sales.Customers as C
where c.country=N'Spain'

select * 
from Sales.Customers as C
where c.country=N'Spain' and exists(select * from Sales.Orders as O where o.custid=C.custid)

select * 
from Sales.Customers as C
where c.country=N'Spain' and not exists(select * from Sales.Orders as O where o.custid=C.custid)

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