Open with Google Docs5. What is a key ineKey is an attribute or column in a table.6. Why do you need Keys?Key is used to uniquely identify a row in a tableStudent TableFNameLNameAl FarsiEmail2015123456.sur@cas.edu.oMobile9384943SID201512345 Aisha6.m201612344 Shams Al2016123444.sur@cas.edu.o96849424aBalushim1201734343Marwa Al Alawi2017343432.sur@cas.edu.o89838382Primary Key:- SIDSuper Key:- It is a set of one or more attributes to uniquely identify a row in a table(SID, EMAIL)Candidate Key: - It is a super key but no redundant attribute.Alternate Key or Secondary Key:- It is a key which is not a primary keyIl

KEY is an attribute of a column in a table.

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5. What is a key in du Key is an attribute or column in a table.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.

Question

Open with Google Docs
5. What is a key ine
Key is an attribute or column in a table.
6. Why do you need Keys?
Key is used to uniquely identify a row in a table
Student Table
FName
LName
Al Farsi
Email
2015123456.sur@cas.edu.o
Mobile
9384943
SID
201512345 Aisha
6.
m
201612344 Shams Al
2016123444.sur@cas.edu.o
9684942
4
a
Balushi
m
1
201734343
Marwa Al Alawi
2017343432.sur@cas.edu.o
8983838
2
Primary Key:- SID
Super Key:- It is a set of one or more attributes to uniquely identify a row in a table
(SID, EMAIL)
Candidate Key: - It is a super key but no redundant attribute.
Alternate Key or Secondary Key:- It is a key which is not a primary key
Il

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