摘要：
--使用Northwind 数据库--比较条件查询-- 大于 >select * from Products where unitprice>25go--等于 =select * from Products where unitprice=25go--小于 <select * from Products where unitprice<25go--不等于 <>select * from Products where unitprice<>25go--范围查询条件--BETWEEN..AND.. select * from Products whe 阅读全文
