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来自:http://www.tuicool.com/articles/fIfm22#770 – The Difference Between a LayoutTransform and aRenderTransformMarch 6, 2013Leave a commentWhen you aret... 阅读全文
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今天在处理SQL的时候遇到几个问题:1、如果指定了 SELECT DISTINCT,那么 ORDER BY 子句中的项就必须出现在选择列表中select distinct id from 收费站 order by name // 错误改成:select distinct id, name from... 阅读全文
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来自:http://blog.sina.com.cn/s/blog_8a0c4f130100zaw2.html先谈谈in和exists的区别:exists:存在,后面一般都是子查询,当子查询返回行数时,exists返回true。select * from class where exists (se... 阅读全文