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摘要:一、SQL数据查询的一般格式 数据查询是数据库的核心操作。SQL提供了SELECT语句进行数据查询,其一般格式为: 整个SELECT语句的含义是,根据WHERE子句的条件表达式从FROM子句指定的基本表、视图或派生表中找出满足条件的元组,再按SELECT子句中的目标列表达式选出元组中的属性值形成结果 阅读全文
posted @ 2018-01-02 17:33 Zoctopus_Zhang 阅读 (22819) 评论 (2) 编辑
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