CREATE TABLE university (
id NUMBER GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1),
name VARCHAR2(10),
CONSTRAINT u_pk PRIMARY KEY (id));
INSERT INTO university (name) VALUES ('ABC');
INSERT INTO university (name) VALUES ('XYZ');
CREATE TABLE persons (
person_id NUMBER GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT
BY 1),
name VARCHAR2(10),
birthdate DATE,
height FLOAT DEFAULT ON NULL 0,
hr_data JSON,
CONSTRAINT person_pk PRIMARY KEY (person_id)
);
INSERT INTO persons (name, height, birthdate, hr_data)
VALUES ('John', 1.80, to_date('13/06/1963', 'DD/MM/YYYY'), '{"department":"IT","role":"Software Developer"}');
INSERT INTO persons (name, height, birthdate, hr_data)
VALUES ('Mary', 1.65, to_date('25/09/1982', 'DD/MM/YYYY'), '{"department":"HR","role":"HR Manager"}');
INSERT INTO persons (name, height, birthdate, hr_data)
VALUES ('Bob', 1.75, to_date('11/03/1966', 'DD/MM/YYYY'), '{"department":"IT","role":"Technical Consultant"}');
INSERT INTO persons (name, height, birthdate, hr_data)
VALUES ('Alice', 1.70, to_date('01/02/1987', 'DD/MM/YYYY'), '{"department":"HR","role":"HR Assistant"}');
CREATE TABLE student_of (
s_id NUMBER GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1),
s_univ_id NUMBER,
s_person_id NUMBER,
subject VARCHAR2(10),
CONSTRAINT stud_pk PRIMARY KEY (s_id),
CONSTRAINT stud_fk_person FOREIGN KEY (s_person_id) REFERENCES persons(person_id),
CONSTRAINT stud_fk_univ FOREIGN KEY (s_univ_id) REFERENCES university(id)
);
INSERT INTO student_of(s_univ_id, s_person_id,subject) VALUES (1,1,'Arts');
INSERT INTO student_of(s_univ_id, s_person_id,subject) VALUES (1,3,'Music');
INSERT INTO student_of(s_univ_id, s_person_id,subject) VALUES (2,2,'Math');
INSERT INTO student_of(s_univ_id, s_person_id,subject) VALUES (2,4,'Science');
CREATE TABLE friends (
friendship_id NUMBER GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1),
person_a NUMBER,
person_b NUMBER,
meeting_date DATE,
CONSTRAINT fk_person_a_id FOREIGN KEY (person_a) REFERENCES persons(person_id),
CONSTRAINT fk_person_b_id FOREIGN KEY (person_b) REFERENCES persons(person_id),
CONSTRAINT fs_pk PRIMARY KEY (friendship_id)
);
INSERT INTO friends (person_a, person_b, meeting_date) VALUES (1, 3, to_date('01/09/2000', 'DD/MM/YYYY'));
INSERT INTO friends (person_a, person_b, meeting_date) VALUES (2, 4, to_date('19/09/2000', 'DD/MM/YYYY'));
INSERT INTO friends (person_a, person_b, meeting_date) VALUES (2, 1, to_date('19/09/2000', 'DD/MM/YYYY'));
INSERT INTO friends (person_a, person_b, meeting_date) VALUES (3, 2, to_date('10/07/2001', 'DD/MM/YYYY'));