m0_37979936的博客

SELECT 选择SELECT column1, column2, ...FROM table_name;SELECT * FROM table_name;SELECT DISTINCT 选择某列中不重复的值SELECT DISTINCT column1, column2, ...FROM table_name;SELECT COUNT 计数SELECT COUNT(colu...

刚学完基础，第一题就让我打击很大，继续练习资源来自：https://www.jianshu.com/p/476b52ee4f1b感谢数据表介绍–1.学生表Student(SId,Sname,Sage,Ssex)–SId 学生编号,Sname 学生姓名,Sage 出生年月,Ssex 学生性别–2.课程表Course(CId,Cname,TId)–CId 课程编号,Cname 课...