Question

1. For each account of the previous question, compute the Balance, and return a table that shows the account number, type, and balance for each account (hint: use UNION).
2. The list of customer names that have transactions greater than or equal to one thousand dollars.

A) Answer this question using only nested queries (i.e., each select is over only one table). B) Answer this query using joins.

Bank.sql is under this statement.

DROP DATABASE IF EXISTS Bank;
CREATE DATABASE Bank;
USE Bank;

DROP TABLE IF EXISTS transaction;
DROP TABLE IF EXISTS customer;
DROP TABLE IF EXISTS account;

CREATE TABLE customer (
name VARCHAR(20),
sex CHAR(1),
ssn CHAR(9) NOT NULL,
phone CHAR(15),
dob DATE,
address VARCHAR(50),
PRIMARY KEY(ssn)

);
  
CREATE TABLE account (
number CHAR(16) UNIQUE NOT NULL,
open_date DATE,
type CHAR(20),
owner_ssn CHAR(9) NOT NULL,
PRIMARY KEY(number)
);
  
CREATE TABLE transaction (
id INT(20) UNIQUE NOT NULL,
amount DECIMAL(9,2),
tdate DATE,
type CHAR(10),
account_num CHAR(16),
PRIMARY KEY(id)
);

INSERT INTO customer VALUE ('John Adam', 'M', '512432341', '[phone]', '1987-11-15',NULL);
INSERT INTO customer VALUE ('Alexander Felix', 'M', '724432341', '[phone]', '1991-05-22', NULL);
INSERT INTO customer VALUE ('Andrew William', 'M', '861894272', '[phone]', '1995-01-04', NULL);
INSERT INTO customer VALUE ('Ana Bert', 'F', '844192241', '[phone]', '1982-12-07', '23 Boston Post Rd, West Haven, CT 06516');

INSERT INTO account VALUE ('1111222233331441', '2018-12-03', 'Checking', '861894272');
INSERT INTO account VALUE ('2111222233332442', '2019-01-06', 'Saving', '512432341');
INSERT INTO account VALUE ('3111222233333443', '2017-09-22', 'Checking', '844192241');
INSERT INTO account VALUE ('4111222233335444', '2016-04-11', 'Checking', '724432341');
INSERT INTO account VALUE ('5111222233339445', '2018-11-05', 'Saving', '724432341');
INSERT INTO transaction VALUE (1001, 202.50, '2019-08-15', 'Deposit', '5111222233339445');
INSERT INTO transaction VALUE (1002, 100.00, '2019-09-21', 'Deposit','2111222233332442');
INSERT INTO transaction VALUE (1003, 200.00, '2019-09-29', 'Deposit', '2111222233332442');
INSERT INTO transaction VALUE (1004, 50.00, '2019-09-29', 'Deposit', '2111222233332442');
INSERT INTO transaction VALUE (1005, 1000.00, '2019-09-29', 'Deposit','3111222233333443');
INSERT INTO transaction VALUE (1006, -202.50, '2019-08-29', 'Withdraw', '5111222233339445');
INSERT INTO transaction VALUE (1007, 50.00, '2019-09-29', 'Deposit', '2111222233332442');
INSERT INTO transaction VALUE (1008, 50.00, '2019-09-29', 'Deposit', '2111222233332442');
INSERT INTO transaction VALUE (1009, -10.00, '2019-09-26', 'Withdraw', '2111222233332442');
INSERT INTO transaction VALUE (1010, 50.00, '2019-09-29', 'Deposit', '4111222233335444');
INSERT INTO transaction VALUE (1011, 320.00, '2019-09-29', 'Deposit', '5111222233339445');
INSERT INTO transaction VALUE (1012, 50.00, '2019-09-18', 'Deposit', '4111222233335444');
INSERT INTO transaction VALUE (1013, 5000.00, '2019-06-21', 'Deposit', '1111222233331441');
INSERT INTO transaction VALUE (1014, -100.00, '2019-09-02', 'Withdraw', '1111222233331441');
INSERT INTO transaction VALUE (1015, -200.00, '2019-09-08', 'Withdraw', '1111222233331441');

Answer 1

Question a:

select number,type ,b.Balance from account a inner join
(select account_num,sum(amount) as Balance from transaction group by account_num) b
on a.number=b.account_num;

• This SQL query is using subquery to get the result

******************************

Question b:

select name,sum(amount) from customer inner join account
on customer.ssn=account.owner_ssn
inner join transaction on account.number=transaction.account_num
group by name
having sum(amount)>1000;

• This SQL query is joining two tables customer and account and will return the result