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_ SQL Queries.sql
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_ SQL Queries.sql
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--######################################################################--
--# #--
--# SQL Queries for Bank Database [10.AUG.2020] #--
--# #--
--######################################################################--
-- ------------------------------------------------
-- Create Schema and Tables
-- ------------------------------------------------
CREATE SCHEMA Bank;
-- ------------------------------------------------
USE Bank;
CREATE TABLE Branch (
id INT,
name CHAR(50) UNIQUE,
address CHAR(50),
PRIMARY KEY (id)
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Card (
id INT,
number CHAR(50) UNIQUE,
expiration_date DATE,
is_blocked BOOL,
PRIMARY KEY (id)
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Loan_type (
id INT,
type CHAR(10) UNIQUE,
description CHAR(100),
base_amount DECIMAL,
base_interest_rate DECIMAL,
PRIMARY KEY (id)
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Loan_type (
id INT,
type CHAR(50) UNIQUE,
description CHAR(100),
base_amount DECIMAL(10, 3),
base_interest_rate DECIMAL(10, 3),
PRIMARY KEY (id)
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Customer (
id INT,
branch_id INT,
first_name CHAR(50),
last_name CHAR(50),
date_of_birth DATE,
gender CHAR(6),
PRIMARY KEY (id),
FOREIGN KEY (branch_id) REFERENCES Branch(id)
ON UPDATE CASCADE
ON DELETE SET NULL
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Account (
id INT,
customer_id INT,
card_id INT,
balance CHAR(50),
PRIMARY KEY (id),
FOREIGN KEY (customer_id) REFERENCES Customer(id)
ON UPDATE CASCADE
ON DELETE SET NULL,
FOREIGN KEY (card_id) REFERENCES Card(id)
ON UPDATE CASCADE
ON DELETE SET NULL
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Loan (
id INT,
account_id INT,
loan_type_id INT,
amount_paid DECIMAL(10, 3),
start_date DATE,
due_date DATE,
PRIMARY KEY (id),
FOREIGN KEY (account_id) REFERENCES Account(id)
ON UPDATE CASCADE
ON DELETE SET NULL,
FOREIGN KEY (loan_type_id) REFERENCES Loan_type(id)
ON UPDATE CASCADE
ON DELETE SET NULL
);
-- ------------------------------------------------
USE Bank;
CREATE TABLE Transaction (
id INT,
account_id INT,
description CHAR(100),
amount DECIMAL(10, 3),
date DATE,
PRIMARY KEY (id),
FOREIGN KEY (account_id) REFERENCES Account(id)
ON UPDATE CASCADE
ON DELETE SET NULL
);
-- ------------------------------------------------
-- Create Users
-- ------------------------------------------------
CREATE USER 'paul2'@'%' IDENTIFIED BY 'password';
CREATE USER 'constantin2'@'%' IDENTIFIED BY 'password';
CREATE USER 'marius2'@'%' IDENTIFIED BY 'password';
GRANT ALL ON *.* TO 'paul2'@'%';
GRANT ALL ON *.* TO 'constantin2'@'%' WITH GRANT OPTION;
GRANT SELECT, UPDATE, DELETE ON *.* TO 'marius2'@'%';
SELECT * FROM mysql.user;
SHOW GRANTS for 'paul2'@'%';
-- ------------------------------------------------
-- Create View
-- ------------------------------------------------
USE Bank;
CREATE VIEW User_role_information AS
SELECT User, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv
FROM mysql.user
WHERE Select_priv = 'Y' OR Insert_priv = 'Y' OR Update_priv = 'Y' OR Delete_priv = 'Y' OR Create_priv = 'Y';
-- ------------------------------------------------
-- Populate the Database
-- ------------------------------------------------
USE Bank;
INSERT INTO Branch (id, name, address) VALUES ('1', 'Albertslund Bank', 'Albertslund');
INSERT INTO Branch (id, name, address) VALUES ('2', 'Norrebro Bank', 'Albertslund');
INSERT INTO Branch (id, name, address) VALUES ('3', 'Kolding Bank', 'Kolding, Jutland');
INSERT INTO Branch (id, name, address) VALUES ('4', 'Glostrup Bank', 'Glostrup');
INSERT INTO Branch (id, name, address) VALUES ('5', 'Valby Bank', 'Valby');
-- ------------------------------------------------
USE Bank;
INSERT INTO Card (id, number, expiration_date, is_blocked) VALUES ('1', '1234567890123456', '2021-01-30', TRUE);
INSERT INTO Card (id, number, expiration_date, is_blocked) VALUES ('2', '1234567890123457', '2022-08-20', TRUE);
INSERT INTO Card (id, number, expiration_date, is_blocked) VALUES ('3', '1234567890123458', '2023-03-21', TRUE);
INSERT INTO Card (id, number, expiration_date, is_blocked) VALUES ('4', '1234567890123459', '2021-01-14', FALSE);
INSERT INTO Card (id, number, expiration_date, is_blocked) VALUES ('5', '1234567890123450', '2021-06-9', TRUE);
-- ------------------------------------------------
USE Bank;
INSERT INTO Loan_type (id, type, description, base_amount, base_interest_rate) VALUES ('1', 'Mortgages loans', 'description1', 10000, 15);
INSERT INTO Loan_type (id, type, description, base_amount, base_interest_rate) VALUES ('2', 'Car loans', 'description2', 5000, 20);
INSERT INTO Loan_type (id, type, description, base_amount, base_interest_rate) VALUES ('3', 'Appliance loans', 'description3', 3000, 25);
INSERT INTO Loan_type (id, type, description, base_amount, base_interest_rate) VALUES ('4', 'Payday loans', 'description4', 1000, 50);
INSERT INTO Loan_type (id, type, description, base_amount, base_interest_rate) VALUES ('5', 'Small Business loans', 'description5', 7000, 35);
-- ------------------------------------------------
USE Bank;
INSERT INTO Customer (id, branch_id, first_name, last_name, date_of_birth, gender) VALUES ('1', '1', 'Paul', 'Panaitescu', '1996-10-7', 'male');
INSERT INTO Customer (id, branch_id, first_name, last_name, date_of_birth, gender) VALUES ('2', '3', 'Constantin', 'Tarau', '1998-09-15', 'male');
INSERT INTO Customer (id, branch_id, first_name, last_name, date_of_birth, gender) VALUES ('3', '1', 'Marius', 'Munteanu', '1998-07-31', 'male');
INSERT INTO Customer (id, branch_id, first_name, last_name, date_of_birth, gender) VALUES ('4', '2', 'Dragos', 'Mocanasu', '1998-12-31', 'female');
INSERT INTO Customer (id, branch_id, first_name, last_name, date_of_birth, gender) VALUES ('5', '2', 'Daenerys', 'Targaryen', '1895-10-7', 'female');
-- ------------------------------------------------
USE Bank;
INSERT INTO Account (id, customer_id, card_id, balance) VALUES ('1', '1', '1', '1000');
INSERT INTO Account (id, customer_id, card_id, balance) VALUES ('2', '2', '2', '100');
INSERT INTO Account (id, customer_id, card_id, balance) VALUES ('3', '3', '3', '200');
INSERT INTO Account (id, customer_id, card_id, balance) VALUES ('4', '5', '4', '50000');
INSERT INTO Account (id, customer_id, card_id, balance) VALUES ('5', '5', '5', '1000000');
-- ------------------------------------------------
USE Bank;
INSERT INTO Loan (id, account_id, loan_type_id, amount_paid, start_date, due_date) VALUES ('1', '1', '3', '0', '2020-05-18', '2023-05-18');
INSERT INTO Loan (id, account_id, loan_type_id, amount_paid, start_date, due_date) VALUES ('2', '5', '1', '0', '2019-08-12', '2021-05-25');
INSERT INTO Loan (id, account_id, loan_type_id, amount_paid, start_date, due_date) VALUES ('3', '4', '2', '100', '2019-05-13', '2024-05-14');
INSERT INTO Loan (id, account_id, loan_type_id, amount_paid, start_date, due_date) VALUES ('4', '2', '5', '1000', '2018-05-25', '2021-05-21');
INSERT INTO Loan (id, account_id, loan_type_id, amount_paid, start_date, due_date) VALUES ('5', '1', '4', '5000', '2020-05-20', '2023-05-07');
-- ------------------------------------------------
USE Bank;
INSERT INTO Transaction (id, account_id, description, amount, date) VALUES ('1', '1', 'description 100', '1000.90', '2020-05-18');
INSERT INTO Transaction (id, account_id, description, amount, date) VALUES ('2', '2', 'description 200', '500.80', '2019-12-07');
INSERT INTO Transaction (id, account_id, description, amount, date) VALUES ('3', '5', 'description 300', '100.90', '2018-06-30');
INSERT INTO Transaction (id, account_id, description, amount, date) VALUES ('4', '5', 'description 400', '5060.7', '2020-01-24');
INSERT INTO Transaction (id, account_id, description, amount, date) VALUES ('5', '5', 'description 500', '500.67', '2018-01-24');
-- ------------------------------------------------
-- Ensure that every account contains a required minimum amount of money at any time.
-- ------------------------------------------------
USE Bank;
delimiter //
CREATE TRIGGER bal_limit_insert BEFORE INSERT ON Account FOR EACH ROW
BEGIN
DECLARE message varchar(50);
IF NEW.balance < 100 THEN
SET message= CONCAT('Insertion error: new balance too low: ', NEW.balance);
SIGNAL SQLSTATE '46000'
SET MESSAGE_TEXT = message;
END IF;
END;
//
CREATE TRIGGER bal_limit_update BEFORE UPDATE ON Account FOR EACH ROW
BEGIN
DECLARE message varchar(50);
IF NEW.balance < 100 THEN
SET message= CONCAT('Update error: new balance too low: ', NEW.balance);
SIGNAL SQLSTATE '46000'
SET MESSAGE_TEXT = message;
END IF;
END;
//
delimiter ;
-- ------------------------------------------------
-- Exercises:
-- ------------------------------------------------
-- 1. List of customers that have accounts in two or more branches of the bank at the same time.
-- ------------------------------------------------
USE Bank;
SELECT c.first_name, c.last_name
FROM Customer c
WHERE c.id IN (SELECT customer_id
FROM Customer_Branch cb
GROUP BY customer_id
HAVING COUNT(*) >= 2);
-- ------------------------------------------------
-- 2. Statement showing who takes loans more often – men or women.
-- ------------------------------------------------
USE Bank;
SELECT gender, COUNT(*) AS count
FROM Customer AS c
WHERE c.id IN (
SELECT customer_id
FROM Account AS a
WHERE a.id IN (
SELECT account_id
FROM Loan AS l))
GROUP BY gender
ORDER BY count DESC;
-- ------------------------------------------------
-- 3. At the end of every year, a statement of all movements is generated for each account.
-- ------------------------------------------------
CREATE EVENT IF NOT EXISTS Account_transactions_every_year
ON SCHEDULE AT '2020-12-31' + INTERVAL 1 year
DO SELECT *
FROM Transaction t
-- ------------------------------------------------
-- 4. List of customers that have never had a loan
-- ------------------------------------------------
USE Bank;
SELECT c.first_name, c.last_name
FROM Customer c
WHERE c.id IN (SELECT a.customer_id
FROM Account a
WHERE a.id NOT IN (SELECT l.account_id
FROM Loan l));
-- ------------------------------------------------
-- 5. Custom: Find customers who have no open accounts.
-- ------------------------------------------------
USE Bank;
SELECT c.first_name, c.last_name
FROM Customer c
WHERE c.id NOT IN (SELECT customer_id
FROM Account cb
GROUP BY customer_id);
-- ------------------------------------------------
-- --- END ---
-- ------------------------------------------------