2009年12月25日
ORACLE文档
摘要： 1.However, any performance increases achieved by adding hardware should be considered a short-term relief to an immediate problem2。In certain circumstances, it is better to use IN rather than EXISTS. ... 阅读全文
posted @ 2009-12-25 17:15 Christmas 阅读(180) 评论(0) 推荐(0) 编辑