烟台商城app开发/seo案例分析及解析

1.查询一个学生在某一年的所有成绩

select sc_student_id as 学号,sc_student_name as 姓名,

sc_course_name as 课程,sc_score as 分数

from t_score

where sc_student_id = 学生学号

and sc_edu_year = 201x-201x;

 

 

 

查询实例1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.查询某一个班的高等数学的成绩

select cl.班级,cl.学生姓名,sc.sc_course_name as 科目,sc.sc_score as 成绩

from

(select st.st_class as 班级,st.st_name as 学生姓名,

from t_student as st

where st.st_class = 班级名) cl

left join t_score as sc

on cl.学生姓名 = sc.sc_student_name

where sc_course_name = "高等数学"

order by 成绩

 

 

查询实例2