feat: Support Composite primary keys

[codekeyz]

CREATE TABLE Students (
    student_id INT PRIMARY KEY,
    student_name VARCHAR(50)
);

CREATE TABLE Courses (
    course_id INT PRIMARY KEY,
    course_name VARCHAR(50)
);

CREATE TABLE Enrollments (
    student_id INT,
    course_id INT,
    PRIMARY KEY (student_id, course_id),
    FOREIGN KEY (student_id) REFERENCES Students(student_id),
    FOREIGN KEY (course_id) REFERENCES Courses(course_id)
);