Database Management Systems and SQL SERVER Multiple tablees.pptx

Database Management
Systems and SQL

DATABASE
Collection of Logically related tables
Why Multiple tables ?

Company
PName Price Category Manufacturer
Hp Computer 30000 Computer Hp Company
Hp Laptop 40000 Computer Hp Company
Iphone 14 Pro 50000 Phone Iphone
Sony TV 20000 Tv Sony
Product
Orders
Order_id ODate Qty Prname
101 2019/11/12 15 Hp Laptop
102 2019/12/13 10
Iphone 14
Pro
103 2019/1211 20 Sony TV
CompName RegDate
Stock
Price
Country
Hp
Company
2019/10/21 25 USA
Iphone 2019/10/3 65 Japan
Sony 2019/10/10 15 India
COMPDTLS
Foreign
key

4
Foreign Keys : Value of FK
either equals to the value
of PK to which it is
referred or NULL

Create table Orders
Orders
101 2019/11/12 15 Hp Laptop
102 2019/12/13 10 Iphone 14 Pro
103 2019/1211 20 Sony TV
create table orders(order_id varchar(5) primary key, odate date
NOT NULL, qty int , prname varchar(20) references
product(pname));

Insert into Orders
Orders
101 2019/11/12 15 Hp Laptop
102 2019/12/13 10 Iphone 14 Pro
103 2019/12/11 20 Sony TV
104 2019/12/12 5 Hp Laptop
105 2019/12/13 7 Sony TV

Hp
Computer
30000 Computer Hp Company
Iphone 14
Pro
50000 Phone Iphone
Product
Orders
Joins
Show the pname, price, orderid, qty
Select pname, price, order_id from
product, orders where pname=prname
Join
between Product
and Order
101 2019/11/12 15 Hp Laptop
102 2019/12/13 10
Iphone 14
Pro
103 2019/12/11 20 Sony TV
104 2019/12/12 5 Hp Laptop
105 2019/12/13 7 Sony TV

Joins
Product (pname, price, category, manufacturer)
orders(order_id, odate,qty, prname)
Find all products names and odate of category Computer;
Select pname, odate from product, orders where product.pname= orders.prname and
category=“Computer”;
List the products names whose ordered qty is greater than 10;
Select pname from Product, orders where qty>10;

SELECT sum(price*3)
FROM Product;
Product
Simple Aggregation
9
SELECT (price*3) as increased_price
FROM Product;

Hp
Computer
30000 Computer Hp Company
Iphone 14
Pro
50000 Phone Iphone
Product Orders
Simple Aggregation
Show the amount of all orders i.e. price* qty
Select (price*qty) as amount from
product, orders where
pname=prname ;
101 2019/11/12 15 Hp Laptop
102 2019/12/13 10
Iphone 14
Pro
103 2019/12/11 20 Sony TV
104 2019/12/12 5 Hp Laptop
105 2019/12/13 7 Sony TV

Grouping and Aggregation
SELECT Sum(price)
FROM Product
GROUP BY category
Product
Count the no of products manufactured by each manufacturer
Find total price of each category
SELECT count(*)
FROM Product
GROUP BY manufacturer

Deletions
DELETE FROM product
WHERE price<40000
Iphone 14
Pro
50000 Phone Iphone
Product
Delete products where price less than 40000

Deletions
DELETE FROM product
Iphone 14
Pro
50000 Phone Iphone
Product
Delete All products

Updation
Update product set price = 35000
WHERE category = ‘Computer’
Iphone 14
Pro
50000 Phone Iphone
Product
Set the price 35000 of all products of Computer category

Updation
Update product set price = price+200
Iphone 14
Pro
50000 Phone Iphone
Product
Increase the price of all products by 200

Updation
Update product set price = price+(price*0.1)
Where manufacturer=“Hp Company”
Iphone 14
Pro
50000 Phone Iphone
Product
Increase the price of all products of Hp Company works by 10%

Create Database Myorg with following two tables
Employee
Department
Empid Empname designation DOJ Sal Comm Dept
Number Varchar Varchar Date Number Number Number
Deptid Deptname Mgrid Location
Number Varchar Number Varchar

VIPS: Oct - Dec 2019 27
Populate Data : Employee
Department

Database Management Systems and SQL SERVER Multiple tablees.pptx

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