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DROP TABLE IF EXISTS employees CASCADE;
DROP TABLE IF EXISTS projects CASCADE;
DROP TABLE IF EXISTS departments CASCADE;
CREATE TABLE departments (
id bigint primary key,
budget decimal
);
CREATE TABLE projects (
id bigint primary key,
department_id bigint references departments(id),
budget decimal
);
CREATE TABLE employees (
id bigint primary key,
department_id bigint references departments(id),
project_id bigint references projects(id),
hired_at date,
title varchar(255),
phone_number varchar(255) NOT NULL,
office_number varchar(255) NOT NULL,
area varchar(255),
salary decimal,
manager bit
);
ALTER TABLE employees ADD CONSTRAINT departments_fk FOREIGN KEY (department_id) REFERENCES departments(id);
ALTER TABLE employees ADD CONSTRAINT projects_fk FOREIGN KEY (project_id) REFERENCES projects(id);
ALTER TABLE projects ADD CONSTRAINT departments_fk FOREIGN KEY (department_id) REFERENCES departments(id);
CREATE UNIQUE INDEX managers_idx on employees(department_id, manager) WHERE manager IS NULL;
CREATE UNIQUE INDEX employee_office_idx on employees(office_number);
CREATE UNIQUE INDEX employee_phone_idx on employees(phone_number);
INSERT INTO departments VALUES (1, 1000.00);
INSERT INTO departments VALUES (2, 2000.00);
INSERT INTO departments VALUES (3, 2000.00);
INSERT INTO projects VALUES (1, 1, 500.00);
INSERT INTO projects VALUES (2, 1, 500.00);
INSERT INTO projects VALUES (3, 3, 1000.00);
INSERT INTO employees VALUES(1, 1, 1, '2019-01-01', 'manager', '+1-555-555-5555', '+1-777-777-7777', 'area 51', 50000.00, '1');
INSERT INTO employees VALUES(2, 1, 1, '2019-01-01', 'engineer', '+1-555-555-0001', '+1-777-777-0001', 'area 51', 100000.00, NULL);
-- duplicate phone number
INSERT INTO employees VALUES(3, 1, 1, '2019-01-01', 'manager', '+1-555-555-5555', '+1-888-888-8888', 'area 51', 50002.00, '1');
-- duplicate office number
INSERT INTO employees VALUES(3, 1, 1, '2019-01-01', 'manager', '+1-666-666-6666', '+1-777-777-7777', 'area 51', 50003.00, '1');
-- two managers for the same department
INSERT INTO employees VALUES(3, 1, 1, '2019-01-01', 'manager', '+1-555-555-0002', '+1-777-777-0002', 'area 51', 50000.00, '1');
SELECT * FROM employees;
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