摘要
在数据库原理课程中,SQL语句是非常重要的知识点,SQL语句的理解程度决定着能否正确使用数据库进行数据的存储和检索。对于初学者而言,分组查询、相关子查询和派生表查询这3个知识点往往是SQL语句学习过程中难以理解的部分。基于此,笔者针对这3个SQL语句中的难点进行分析,以帮助初学者更为透彻地理解这部分知识。
In the course of database principle, SQL statement is a very important knowledge point. The understanding of SQL statement determines whether the database can be used correctly for data storage and retrieval. For beginners, grouping query, related sub query and derived table query are often difficult to understand in the process of learning SQL statements. Therefore, this paper discusses the difficulties in these three SQL statements in simple terms, so as to help beginners of database principle understand this part of knowledge more thoroughly.
作者
吴军
张琳
WU Jun;ZHANG Lin(School of Information Engineering,Zunyi Normal University,Zunyi Guizhou 563006,China)
出处
《信息与电脑》
2021年第18期53-55,共3页
Information & Computer
基金
贵州省科技厅联合基金项目(项目编号:黔科合LH字[2017]7069)。
