摘要
SELECT语句作为SQL中的核心,具有非常丰富的成份和强大的查询功能,也是使用最为频繁的语句之一。掌握SE-LECT语句的应用技巧就等于掌握了SQL的精髓。本文通过实例,论证SELECT语句在对数据集进行分组、聚合、交集、差集、连接、联合查询方面独特的应用技巧。
SQL SELECT statement as the core,with very rich content and powerful query capabilities,but also one of the most frequently used statements.Application of skills to master SELECT statement is equivalent to master the essence of SQL.Through examples,demonstration SELECT statements to group sets of data,aggregation,intersection,difference,connection,joint inquiries unique application techniques.
出处
《软件》
2011年第4期34-35,41,共3页
Software
