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See the following tables:

Order Table
Order_ID Product_ID Order_Quantity Customer_Name
O001 P101 2 Aarav Sharma

O002 P102 1 Priya Patel
O003 P101 1 Rahul Verma

O004 P103 3 Sneha Iyer

Product Table
Product_ID Product_Name Price Stock_Quantity

P101 Laptop 50000 20
P102 Smartphone 25000 50

P103 Headphones 1500 100
P104 Mouse 800 200

Now, answer the following questions:
(a) Name the primary key in the Product Table.

(b) How many records or tuples exist in the Order Table.
(c) Name the key that creates the relationship between the Order Table and the Product Table.

INTRODUCTION TO SQL

SQL stands for Structured Query Language. It is the standard language for managing relational
databases and performing various operations on the data in the tables. SQL enable us to store,
retrieve and manipulate data in the form of tables.

High Integrates
Easy to Performance Free of Provides with Ensures Enables
use and Cost Offers High Various Data Multi-user
Efficiency Portability Security Platforms Integrity Access

Key Features of SQL

SQL was developed by IBM researchers Raymond Boyce and Donald Chamberlin in the 1970s.

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