postgres composite primary key

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Ambre
11 Sep 2019
1CREATE TABLE course_grades (
2    quarter_id INTEGER,
3    course_id TEXT,
4    student_id INTEGER,
5    grade INTEGER,
6    PRIMARY KEY(quarter_id, course_id, student_id)
7);
Emelie
23 Jun 2019
1PRIMARY KEY(pk_1, pk_2, ..., pk_n)
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