[Assignment 1 - DB] Nguyen Le Thien An #2
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tpdongcs
reviewed
Oct 5, 2023
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| -- điểm số trung bình của các course (quy ra lại theo chữ cái) | ||
| select t.course_id, t.course_name, | ||
| case when t.avg_grade_num = 10 then 'A' |
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should use >= , <= ... because avg may return float number
| -- những course (distinct) mà 1 professor cụ thể đang dạy | ||
| select distinct c.course_id, c.course_name, p.prof_id, p.prof_fname, p.prof_lname | ||
| from professor as p join class as cl on p.prof_id = cl.prof_id | ||
| join course as c on cl.course_id = c.course_id; |
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this question meaning that, we already have prof_id, and find all distinct course that he teach
| prof_id int not null, | ||
| prof_lname varchar(50), | ||
| prof_fname varchar(50), | ||
| primary key (prof_id) |
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should add auto increase primary id ( and for all tables too)
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