mrfangzheng

Hope and fear are useless. Be confident, and always be prepared for the worst.

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数据库语句的基本步骤

摘要：挑选数据源 from join 过滤结果集 where 分组 group by 聚合函数计算比如max 过滤分组 having 计算所有表达式排序 order by 挑选结果列 select 阅读全文

posted @ 2008-08-19 09:12 mrfangzheng 阅读(175) 评论(0) 推荐(0) 编辑