Why are primary keys important when constructing a database?

Asked by Last Modified  

1 Answer

Learn Database Training

Follow 1
Answer

Please enter your answer

Gangaraju Kondapalli

IT Professional Trainer with 12 years of experience in IT Industry

Primary key is used to identify the particular record in entire entity. We can have only one primary key per table and we can use multiple columns in primary key and we called it as composite primary key. If we don't have primary key on table, table will be on heap and will face performance issues.
Comments
Dislike Bookmark

Related Questions

Hello Friends, myself Santhosh. I completed M.sc Computer Science in 2015. I was preparing for bank exams, but couldn't succeed. So, I want to change my career to software field. Please give me any suggestions to which technology to learn, so that I could get placed?
Being an M.Sc Computer Science graduate, you should be in a position to code at this moment. If not, start learning the basics of Python (as Python has more opportunities) from Youtube and Udemy videos...
Santhosh
I want to take online classes on database/ ETL testing. Also i look forward to teach Mathematics/Science for class X-XII
Both are co-related to each other but compare to DBA Jobs, ETL job is more demanding hence you take class for informatica tools and others.
Varsha
0 0
7
What are the job operations related to DBMS after mca ?
You can choice Database Developer or DBA Profile....
Shrutika
Hi, I'm an automation test engineer and a certified s/w test engineer (CSTE - QAI). I work with databases at a beginner level but I'm planning to master working with databases. I'm interested in taking a certification exam as-well. I am not interested in making a career switch but want to add it to my skill set. Considering my background, what training/certification should I go for? Please also suggest some beginner level certifications that would be helpful for me to add to my skill set.
Should be learn Biggener of Database then Advance Courses in DB.
Kumar
My name is Rajesh , working as a Recruiter from past 6 years and thought to change my career into software (development / admin/ testing ) am seeking for some suggestion which technology I need to learn ? Any job after training ? Or where I can get job within 3 months after finishing my training programme- your advices are highly appreciated
Mr rajesh if you want to enter in to software Choose SAP BW AND SAP HANA because BW and HANA rules the all other erp tools next 50 years.it provides rubust reporting tools for quicker decesion of business It very easy to learn
Rajesh
1 0
6

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

SQL Subqueries - Used in various ways
If you master the concepts of subqueries, you would gain a lot of flexibility in writing complex SQL queries. Let's not get into Correlated subqueries, let us see the different versions of nested subquery...

Gavi Y.

1 0
0
What is a SQL join?
A SQL join is a Structured Query Language (SQL) instruction to combine data from two sets of data (e.g. two tables). Before we dive into the details of a SQL join, let’s briefly discuss what SQL...

Itech Analytic Solutions

0 0
0
Microsoft Excel
Software developed and manufactured by Microsoft Corporation that allows users to organize, format, and calculate data with formulas using a spreadsheet system broken up by rows and columns. Microsoft...

Itech Analytic Solutions

0 0
0
HTML (Hypertext Markup Language)
HTML (Hypertext Markup Language) is the set of markup symbols or codes inserted in a file intended for display on a World Wide Web browser page. The markup tells the Web browser how to display a Web page's...

Itech Analytic Solutions

1 0
0
What is Microsoft Access?
Microsoft Access has been around for some time, yet people often still ask me what is Microsoft Access and what does it do? Microsoft Access is a part of the Microsoft Office Suite. It does not come with...

Itech Analytic Solutions

0 0
0

Recommended Articles

Make a Career in Database Administration

Database Administration is the process building, organizing and maintaining custom databases for meeting the specific data requirements of an organization. A Database Administrator (DBA) is the person in charge of all the procedures involved in database development, organization, retrieval and security. A DBA has to understand...

Read full article >

Why Should you Become an IT Consultant

Information technology consultancy or Information technology consulting is a specialized field in which one can set their focus on providing advisory services to business firms on finding ways to use innovations in information technology to further their business and meet the objectives of the business. Not only does...

Read full article >

Learn Microsoft Excel

Microsoft Excel is an electronic spreadsheet tool which is commonly used for financial and statistical data processing. It has been developed by Microsoft and forms a major component of the widely used Microsoft Office. From individual users to the top IT companies, Excel is used worldwide. Excel is one of the most important...

Read full article >

What is Applications Engineering all about?

Applications engineering is a hot trend in the current IT market.  An applications engineer is responsible for designing and application of technology products relating to various aspects of computing. To accomplish this, he/she has to work collaboratively with the company’s manufacturing, marketing, sales, and customer...

Read full article >

Find Database Training classes near you
Database Training classes in Bangalore
Database Training classes in Hyderabad
Database Training classes in Mumbai
Database Training classes in Pune
Database Training classes in Delhi
Database Training classes in Chennai
Database Training classes in Kolkata
Database Training classes in Ghaziabad
Database Training classes in Noida
Database Training classes in Gurgaon

Looking for Database Training classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you