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SELECT city_sel AS city FROM Sellers UNION ALL SELECT city_cust AS city FROM Customer ORDER BY city DESC
CREATE TABLE Products (prod_id int PRIMARY KEY not null,
name nvarchar(50) null,
price int null,
description nvarchar(50) null)
CREATE TABLE Sell_2015 (id_sel int PRIMARY KEY not null,
prod_id int not null,
count int null,
sel_date date)
CREATE TABLE Sell_2016 (id_sel int PRIMARY KEY not null,
prod_id int not null,
count int null,
sel_date date)
CREATE TABLE Sell_2017 (id_sel int PRIMARY KEY not null,
prod_id int not null,
count int null,
sel_date date)
INSERT INTO Products (prod_id, name, price, description) VALUES
(1, 'Notebook Asser15.6 intel core i5', 500, 'ddr 500'),
(2, 'Notebook Asser13.3 intel core i5', 600, 'ssd 125'),
(3, 'Notebook Asser13.3 intel core i7', 750, 'ssd 250'),
(4, 'Notebook HP13.3 intel core i7', 800, 'ssd 250'),
(5, 'Notebook HP15.6 intel core i7', 600, 'ddr 1trb'),
(6, 'Mouse laser', 10, 'Geniuse'),
(7, 'Mouse Bletooth', 15, 'HP')
INSERT INTO Sell_2015 (id_sel, prod_id, count, sel_date) VALUES
(1, 1, 1, '2015-04-01'),
(2, 3, 1, '2015-08-25'),
(3, 6, 5, '2015-10-10'),
(4, 2, 1, '2015-10-25'),
(5, 7, 3, '2015-12-23')
INSERT INTO Sell_2016 (id_sel, prod_id, count, sel_date) VALUES
(1, 2, 1, '2016-02-12'),
(2, 3, 2, '2016-02-26'),
(3, 4, 1, '2016-04-12'),
(4, 5, 2, '2016-06-20'),
(5, 8, 4, '2016-09-23')
INSERT INTO Sell_2017 (id_sel, prod_id, count, sel_date) VALUES
(1, 1, 1, '2017-04-12'),
(2, 4, 1, '2017-05-26'),
(3, 5, 1, '2017-07-12'),
(4, 7, 5, '2017-09-20')
SELECT name, id_sel, sel_date, count FROM Products, Sell_2015 UNION
SELECT name, id_sel, sel_date, count FROM Products, Sell_2015 WHERE Sell_2015.prod_id = Products.prod_id UNION
SELECT name, id_sel, sel_date, count FROM Products, Sell_2016 WHERE Sell_2016.prod_id = Products.prod_id UNION
SELECT name, id_sel, sel_date, count FROM Products, Sell_2017 WHERE Sell_2017.prod_id = Products.prod_id
SELECT name, id_sel, sel_date, count FROM Products, Sell_2015 UNION ALL
SELECT name, id_sel, sel_date, count FROM Products, Sell_2015 WHERE Sell_2015.prod_id = Products.prod_id UNION ALL
SELECT name, id_sel, sel_date, count FROM Products, Sell_2016 WHERE Sell_2016.prod_id = Products.prod_id UNION ALL
SELECT name, id_sel, sel_date, count FROM Products, Sell_2017 WHERE Sell_2017.prod_id = Products.prod_id
SELECT name, id_sel, sel_date, count FROM Products, Sell_2017 WHERE Sell_2017.prod_id = Products.prod_id
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