11 2010 档案

SQL.Server.2005.T-SQL.Querying 流水账 chapter1
摘要: 1.sql语句执行顺序这也解释了为什么会报mainid找不到，因为这个时候还没执行as这句。2.A confusing aspect of queries containing an OUTER JOIN clause is whether to specify a logical expression in the ON filter or in the WHERE filter.The mai...阅读全文
posted @ 2010-11-05 17:55 lightwalker 阅读(136) | 评论 (0) 编辑