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‎DB Requirements.docx

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‎ILS_DB_code.sql

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-- Creating the tables --
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CREATE TABLE teacher (
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teacher_id INT PRIMARY KEY,
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first_name VARCHAR(40) NOT NULL,
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last_name VARCHAR(40) NOT NULL,
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language_1 VARCHAR(3) NOT NULL,
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language_2 VARCHAR(3),
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dob DATE,
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tax_id INT UNIQUE,
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phone_no VARCHAR(20)
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);
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CREATE TABLE client (
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client_id INT PRIMARY KEY,
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client_name VARCHAR(40) NOT NULL,
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address VARCHAR(60) NOT NULL,
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industry VARCHAR(20)
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);
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CREATE TABLE participant (
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participant_id INT PRIMARY KEY,
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first_name VARCHAR(40) NOT NULL,
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last_name VARCHAR(40) NOT NULL,
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phone_no VARCHAR(20),
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client INT
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);
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CREATE TABLE course (
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course_id INT PRIMARY KEY,
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course_name VARCHAR(40) NOT NULL,
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language VARCHAR(3) NOT NULL,
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level VARCHAR(2),
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course_length_weeks INT,
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start_date DATE,
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in_school BOOLEAN,
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teacher INT,
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client INT
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);
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-- Altering the tables to establish the relationships via FOREIGN KEYs
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ALTER TABLE participant
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ADD FOREIGN KEY(client)
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REFERENCES client(client_id)
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ON DELETE SET NULL;
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ALTER TABLE course
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ADD FOREIGN KEY(teacher)
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REFERENCES teacher(teacher_id)
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ON DELETE SET NULL;
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ALTER TABLE course
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ADD FOREIGN KEY(client)
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REFERENCES client(client_id)
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ON DELETE SET NULL;
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CREATE TABLE takes_course (
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participant_id INT,
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course_id INT,
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PRIMARY KEY(participant_id, course_id),
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FOREIGN KEY(participant_id) REFERENCES participant(participant_id) ON DELETE CASCADE, -- it makes no sense to keep this rtelation when a participant or course is no longer in the system, hence why CASCADE this time
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FOREIGN KEY(course_id) REFERENCES course(course_id) ON DELETE CASCADE
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);
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/*
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-- If needed to quickly delete and re-build the tables:
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SET FOREIGN_KEY_CHECKS = 0;
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DROP TABLE client;
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DROP TABLE course;
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DROP TABLE participant;
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DROP TABLE takes_course;
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DROP TABLE teacher;
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SET FOREIGN_KEY_CHECKS = 1;
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*/
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-- Populating the tables
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INSERT INTO teacher VALUES
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(1, 'James', 'Smith', 'ENG', NULL, '1985年04月20日', 12345, '+491774553676'),
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(2, 'Stefanie', 'Martin', 'FRA', NULL, '1970年02月17日', 23456, '+491234567890'),
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(3, 'Steve', 'Wang', 'MAN', 'ENG', '1990年11月12日', 34567, '+447840921333'),
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(4, 'Friederike', 'Müller-Rossi', 'DEU', 'ITA', '1987年07月07日', 45678, '+492345678901'),
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(5, 'Isobel', 'Ivanova', 'RUS', 'ENG', '1963年05月30日', 56789, '+491772635467'),
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(6, 'Niamh', 'Murphy', 'ENG', 'IRI', '1995年09月08日', 67890, '+491231231232');
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INSERT INTO client VALUES
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(101, 'Big Business Federation', '123 Falschungstraße, 10999 Berlin', 'NGO'),
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(102, 'eCommerce GmbH', '27 Ersatz Allee, 10317 Berlin', 'Retail'),
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(103, 'AutoMaker AG', '20 Künstlichstraße, 10023 Berlin', 'Auto'),
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(104, 'Banko Bank', '12 Betrugstraße, 12345 Berlin', 'Banking'),
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(105, 'WeMoveIt GmbH', '138 Arglistweg, 10065 Berlin', 'Logistics');
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INSERT INTO participant VALUES
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(101, 'Marina', 'Berg','491635558182', 101),
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(102, 'Andrea', 'Duerr', '49159555740', 101),
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(103, 'Philipp', 'Probst', '49155555692', 102),
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(104, 'René', 'Brandt', '4916355546', 102),
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(105, 'Susanne', 'Shuster', '49155555779', 102),
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(106, 'Christian', 'Schreiner', '49162555375', 101),
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(107, 'Harry', 'Kim', '49177555633', 101),
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(108, 'Jan', 'Nowak', '49151555824', 101),
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(109, 'Pablo', 'Garcia', '49162555176', 101),
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(110, 'Melanie', 'Dreschler', '49151555527', 103),
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(111, 'Dieter', 'Durr', '49178555311', 103),
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(112, 'Max', 'Mustermann', '49152555195', 104),
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(113, 'Maxine', 'Mustermann', '49177555355', 104),
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(114, 'Heiko', 'Fleischer', '49155555581', 105);
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INSERT INTO course VALUES
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(12, 'English for Logistics', 'ENG', 'A1', 10, '2020年02月01日', TRUE, 1, 105),
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(13, 'Beginner English', 'ENG', 'A2', 40, '2019年11月12日', FALSE, 6, 101),
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(14, 'Intermediate English', 'ENG', 'B2', 40, '2019年11月12日', FALSE, 6, 101),
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(15, 'Advanced English', 'ENG', 'C1', 40, '2019年11月12日', FALSE, 6, 101),
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(16, 'Mandarin für Autoindustrie', 'MAN', 'B1', 15, '2020年01月15日', TRUE, 3, 103),
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(17, 'Français intermédiaire', 'FRA', 'B1', 18, '2020年04月03日', FALSE, 2, 101),
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(18, 'Deutsch für Anfänger', 'DEU', 'A2', 8, '2020年02月14日', TRUE, 4, 102),
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(19, 'Intermediate English', 'ENG', 'B2', 10, '2020年03月29日', FALSE, 1, 104),
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(20, 'Fortgeschrittenes Russisch', 'RUS', 'C1', 4, '2020年04月08日', FALSE, 5, 103);
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INSERT INTO takes_course VALUES
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(101, 15),
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(101, 17),
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(102, 17),
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(103, 18),
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(104, 18),
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(105, 18),
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(106, 13),
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(107, 13),
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(108, 13),
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(109, 14),
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(109, 15),
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(110, 16),
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(110, 20),
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(111, 16),
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(114, 12),
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(112, 19),
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(113, 19);
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-- Now for some fun! It's query-time.
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-- Get all the details from the teachers table.
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SELECT *
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FROM teacher;
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-- Get the last names and birthdays of all the teachers.
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SELECT last_name, dob
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FROM teacher;
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-- Get the names and phone numbers of all teachers born before 1990.
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SELECT first_name, last_name, phone_no
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FROM teacher
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WHERE dob < '1990年01月01日';
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-- Do the same as before but use aliasing.
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SELECT first_name AS First Name, last_name AS 'Last Name', phone_no AS Telephone
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FROM teacher
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WHERE dob < '1990年01月01日';
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-- Get all particpants in classes taught by Niamh Murphy
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SELECT participant.first_name, participant.last_name
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FROM participant
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JOIN takes_course ON takes_course.participant_id = participant.participant_id
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JOIN course ON takes_course.course_id = course.course_id
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WHERE takes_course.course_id =
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(SELECT takes_course.course_id
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WHERE course.teacher = 6);
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-- Get the course details for all courses which take place at the client's offices.
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SELECT course.course_id, course.course_name, course.language, client.client_name, client.address
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FROM course
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JOIN client
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ON course.client = client.client_id
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WHERE course.in_school = FALSE;
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-- Get the course details for all courses which take place at the client's offices, which are taught
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-- by Stefanie Martin (as above, but with added details).
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SELECT course.course_id, course.course_name, course.language, client.client_name, client.address
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FROM course
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JOIN client
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ON course.client = client.client_id
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WHERE course.in_school = FALSE AND course.teacher = 2;

‎Tables.xlsx

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