postgres composite primary key
CREATE TABLE course_grades (
quarter_id INTEGER,
course_id TEXT,
student_id INTEGER,
grade INTEGER,
PRIMARY KEY(quarter_id, course_id, student_id)
);postgres composite primary key
CREATE TABLE course_grades (
quarter_id INTEGER,
course_id TEXT,
student_id INTEGER,
grade INTEGER,
PRIMARY KEY(quarter_id, course_id, student_id)
);postgres composite primary key
PRIMARY KEY(pk_1, pk_2, ..., pk_n)Copyright © 2021 Codeinu
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