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database's Introduction

Database

哈工大数据库实验:2016年

#实验一 正常的sql语句

#实验二 Python中链接数据库:执行sql语句并将结果输出

#实验三 实现一个数据库系统:基于PyQt4写的界面,并实现实验要求

#实验四 1)实现关系选择算法; 2)实现关系投影算法; 3)实现连接操作算法(要求实现三种连接操作算法:Nest-Loop- Join算法,Hash-Join算法); 4)实现集合并操作算法(要求实现基于排序的并操作执行算法);

#实验五 select [ ename = 'marry' & dname = 'research' ] ( employee join department ) projection [ bdate ] ( select [ ename = 'jhon' & dname = 'research' ] ( employee join department ) ) select [ essn = '01' ] ( projection [ essn , pname ] ( works_on join project ) )

select * from table order by table_feature into outfile 'filename';

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