摘要：
比如在Northwind数据库中有一个查询为SELECT c.CustomerId,CompanyName FROM Customers cWHERE EXISTS(SELECT OrderID FROM Orders o WHERE o.CustomerID=c.CustomerID)这里面的EX... 阅读全文
posted @ 2014-12-26 12:12
captain_gao
阅读(153)
评论(0)
推荐(0)
浙公网安备 33010602011771号