Primary key and unique key

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What is the Difference between Primary Key and Unique Key - Database Tutorial 14

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Database Tutorial. This video is about Database Fundamentals. I hope this series of videos can help those who want to be Database Professionals. I will cover various database technologies including Oracle Database, Microsoft SQL Server database and Sybase. Video: What is the Difference between Primary Key and Unique Key (Video 14 in the Database Tutorial Series) (Common for Oracle/Microsft SQL Server/Sybase /MySQL)

Differences between primary key and unique key - SQL Server Interview Questions

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Hi Friends, In this in this session we are going to learn the differences between primary key and unique key This is one of the most frequently asked sql server interview questions. Before we discuss the difference between primary key and unique key, let's see what a primary key is and what a unique key is. Primary Key: Primary key is a key which uniquely identifies each row/record in the table. This implies if you have a primary key on a table, you can identify each and every row in that table uniquely using primary key. Unique Key: Unique key constraint enforces the uniqueness on the columns in which it is defined. That is Unique key will make sure only unique values are allowed in the columns in which it is defined. Similarities: Both Primary key and unique Key enforces uniqueness on the columns on which they are defined. • Primary key and unique Key columns allow only unique values. • Primary key and unique Key columns will avoid duplicates • Both Primary key and unique Key columns uniquely identifies each row/record in the table Differences: PRIMARY KEY UNIQUE KEY Primary Key Does not allow duplicates Unique key allows only one NULL A table can have only 1 Primary Key A table can have multiple Unique Keys By default Primary Key creates a Unique Clustered Index on the table By default Unique Key creates a Unique Non-Clustered Index on the table. I hope this session is clear and i hope this knowldge should help you in interviews. Please share your valuable comments & sugesstions. Also, subscriber to my channel for more sql server interview questions and answers. Bye bye & Have a good day.

Primary key and Foreign Key in DBMS

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Primary key vs Foreign key in DBMS. Key concepts in DBMS. (Candidate key, Primary Key, Foreign Key, Alternate Key, Super Key)

Primary key Vs Unique key in SQL in Hindi | What is the index in DBMS | clustered index in sql Hindi

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#worldgyansoftwareinterview Primary key will not accept NULL values whereas Unique key can accept one NULL value. A table can have only primary key whereas there can be multiple unique key on a table. A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index Website: 🤍 Subscribe review non technical channel: 🤍 Please visit this playlist for Angular Authentication in English 🤍 Please visit this playlist for Angular 10 Authentication in Hindi 🤍 Please visit this playlist for Advanced Angular 10 Tutorial in Hindi 🤍 Advance Angular 10 Tutorials in English 🤍 Advance JavaScript In English 🤍 Django REST Framework and react.js tutorial In Hindi 🤍 React Node tutorial in hindi | MERN Stack In hindi 🤍 Angular 8 complete enterprise-level real-life application with github code (Laravel backend) 🤍 Laravel complete (Garage Management System ) enterprise level real-life application with GitHub code in hindi 🤍 Discussion about web development technology in Hindi 🤍

c# (Csharp) and SQL interview question :- What is the difference between unique key and primary key?

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For more such videos visit 🤍 For more such videos subscribe 🤍 See our other Step by Step video series below :- Learn Data Science in 1 hour :- 🤍 Learn Power BI Step by Step:- 🤍 Learn MSBI Step by Step in 32 hours:- 🤍 Learn Tableau step by step :- 🤍 Learn SQL Server Step by Step 🤍 Learn Angular tutorial step by step 🤍 Learn MVC Core step by step :- 🤍 Learn C# Step by Step 🤍 Learn Design Pattern Step by Step 🤍 Learn SharePoint Step by Step in 8 hours:- 🤍 Unique key can have nulls Primary key cannot have nulls. In a single table we can create multiple unique keys.In a single table we can have only one primary key. = Unique key creates a non-clustered index by default.Primary Key created a clustered index by default. Both unique keys and primary keys can be referenced by foreign key. For more such videos visit 🤍 We are also distributing a 100 page Ebook "Sql Server Interview Questions ". If you want this ebook please share this video in your facebook/twitter/linkedin account and email us on questpond🤍questpond.com with the shared link and we will email you the PDF. Buy Questpond videos on discount - 🤍

Learn SQL the right way - session 3 | Primary Key vs Unique Key | Trendytech

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Want to learn Big Data by Sumit Sir? checkout the Big Data course details here: 🤍 In this session we have talked about various constraints in SQL Primary Key Unique Key Auto Increment Values Primary vs Unique Key TABLE OF CONTENT 2:25 Primary key 11:00 Auto increment key 14:00 Unique key 15:30 Primary key vs Unique key 𝗝𝗼𝗶𝗻 𝗺𝗲 𝗼𝗻 𝗦𝗼𝗰𝗶𝗮𝗹 𝗠𝗲𝗱𝗶𝗮:🔥 🔅Sumit LinkedIn - 🤍 🔅Sumit Instagram - 🤍 If you're looking to master SQL with real time usecases & looking to crack top product based companies, this tutorial is for you. Just follow through and you'll be able to write SQL queries in no time. SQL, short for Structured Query Language, is a language used by software developers, data engineers, data scientists and anyone who works with data. With SQL, you can store data in relational databases and write queries to extract valuable information. Even if you are someone who is working on SQL Server, Oracle DB, PostgreSQL or any other relational DB. Then you should be able to use your learning with hardly 5% syntax change. #SQL #RDBMS #database #bigdata #dataengineering

Primary Key vs Foreign Key vs Unique Key in DBMS

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#DecodeITeS Primary v/s Foreign v/s Unique Key Primary Key Unique Key Foreign Key Primary Key does not allow NULL Values. Unique Key is like Primary Key, the only difference Unique allows single NULL value. Foreign Key can have multiple NULL values, weather referencing key is Primary or Unique. Each Table can have only one Primary Key. Table can have multiple Unique Keys. Table can have multiple Foreign Keys. Primary Key creates Clustered Index by default. Unique Key creates Non-Clustered Index by default. Foreign Key does not create any index by default although you can add clustered or non-clustered index manually on foreign key field. Primary Key can be created on auto increment field (Identity Column). Unique key does not support auto increment field (Identity Column). Foreign key does not support auto increment field (Identity Column). Primary key can be created on temporary tables and table variables. Unique key can be created on temporary tables and table variables. Foreign key cannot be created on temporary tables and table variables.

MySQL Primary key Vs Unique key

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#shorts MySQL Primary key Vs Unique key primary key, unique key, primary key vs unique key, mysql primary key, sql unique key vs primary key, primary key and foreign key, primary vs unique key sql, primary key in hindi, unique column vs primary key, primary key in database, unique key constraint, foreign key, primary key sql, primary key in sql, primary key in dbms, primary key kya hai, primary key in mysql, primary key example, foreign key and primary key in sql, primary key constraint

Create custom keys for your Power BI relationships

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Enough of these single table models! Model your data and create custom keys within Power BI to make your reports more efficient! ⏬ Download sample: 🤍 📢 Become a member: 🤍 * Want to take your Power BI skills to the next level? We have training courses available to help you with your journey. 🎓 Guy in a Cube courses: 🤍 * LET'S CONNECT! * 🤍 🤍 🤍 🤍 🤍 🤍 *Gear* Check out my Tools page - 🤍 #PowerBI #GuyInACube

Primary & Foreign Keys

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Primary key on two columns SQL Server

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Primary key on multiple columns example | Composite primary key | Composite key example | Primary key on two columns | Composite key in DBMS | Table composite key Notes and Slides 🤍 SQL Server Tutorial for beginners course page. 🤍 SQL Server Tutorial for beginners playlist 🤍 SQL Server Interview Questions and Answers 🤍 SQL Server Performance Tuning and Query Optimization 🤍

CONSTRAINTS IN SQL

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Primary Key and Foreign Key Tutorial in MySQL | What is Primary Key and Foreign Key DBMS | Edureka

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🔥 𝐄𝐝𝐮𝐫𝐞𝐤𝐚 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐈𝐧𝐭𝐞𝐥𝐥𝐢𝐠𝐞𝐧𝐜𝐞 𝐌𝐚𝐬𝐭𝐞𝐫𝐬 𝐂𝐨𝐮𝐫𝐬𝐞 Visit: 🤍 (Use Code "𝐘𝐎𝐔𝐓𝐔𝐁𝐄𝟐𝟎") This Edureka video on "Primary Key and Foreign Key in MySQL '' will introduce you to the concept of Primary Key and Foreign Key with a hands-on demo on MySQL Workbench. We will discuss the Syntax with examples and understand how to create a table with Primary Key and Foreign Key restrictions. If you have any queries, please mention in the comment section below and let us know if you have any more points to add in this video. Following pointers are covered in this Primary Key and Foreign Key in MySQL video: 00:00 Introduction 00:26 Agenda 00:42 What is Primary Key? 01:03 Example of Primary Key 02:00 Syntax 02:49 What is Foreign Key? 03:08 Example of Foreign Key 04:07 Syntax 04:53 Hands-on Tutorial on Primary Key and Foreign Key 🔴Subscribe to our channel to get video updates. Hit the subscribe button above: 🤍 -𝐄𝐝𝐮𝐫𝐞𝐤𝐚 𝐎𝐧𝐥𝐢𝐧𝐞 𝐓𝐫𝐚𝐢𝐧𝐢𝐧𝐠 𝐚𝐧𝐝 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧- 🔵 DevOps Online Training: 🤍 🌕 AWS Online Training: 🤍 🔵 Data Science Online Training: 🤍 🌕 Tableau Online Training: 🤍 🔵 Power BI Online Training: 🤍 🌕 Selenium Online Training: 🤍 🔵 PMP Online Training: 🤍 🌕 Salesforce Online Training: 🤍 🔵 Cybersecurity Online Training: 🤍 🌕 Java Online Training: 🤍 🔵 Big Data Online Training: 🤍 🌕 RPA Online Training: 🤍 🔵 Python Online Training: 🤍 🌕 Azure Online Training: 🤍 🔵 GCP Online Training: 🤍 🌕 Microservices Online Training: 🤍 -𝐄𝐝𝐮𝐫𝐞𝐤𝐚 𝐑𝐨𝐥𝐞-𝐁𝐚𝐬𝐞𝐝 𝐂𝐨𝐮𝐫𝐬𝐞𝐬- 🔵 DevOps Engineer Masters Program: 🤍 🌕 Cloud Architect Masters Program: 🤍 🔵 Data Scientist Masters Program: 🤍 🌕 Big Data Architect Masters Program: 🤍 🔵 Machine Learning Engineer Masters Program: 🤍 🌕 Business Intelligence Masters Program: 🤍 🔵 Python Developer Masters Program: 🤍 🌕 RPA Developer Masters Program: 🤍 🔵 Web Development Masters Program: 🤍 🌕 Computer Science Bootcamp Program : 🤍 🔵 Cyber Security Masters Program: 🤍 🌕 Full Stack Developer Masters Program : 🤍 🔵 Automation Testing Engineer Masters Program : 🤍 🌕 Python Developer Masters Program : 🤍 🔵 Azure Cloud Engineer Masters Program: 🤍 𝐄𝐝𝐮𝐫𝐞𝐤𝐚 𝐏𝗼𝘀𝘁 𝗚𝗿𝗮𝗱𝘂𝗮𝘁𝗲 𝐂𝐨𝐮𝐫𝐬𝐞𝐬 🔵 Artificial and Machine Learning PGD with E & ICT Academy NIT Warangal: 🤍 🌕 Post Graduate Program in DevOps with Purdue University: 🤍 #SQL #SQLSERVER #MYSQL #Edureka #MYSQLWORKBENCH #CREATETABLE #CREATETABLEINMYSQL #SQLTUTORIAL #MYSQLTUTORIAL 📢📢 𝐓𝐨𝐩 𝟏𝟎 𝐓𝐫𝐞𝐧𝐝𝐢𝐧𝐠 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐭𝐨 𝐋𝐞𝐚𝐫𝐧 𝐢𝐧 𝟐𝟎𝟐𝟐 𝐒𝐞𝐫𝐢𝐞𝐬 📢📢 ⏩𝐓𝐨𝐩 𝟏𝟎 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐭𝐨 𝐋𝐞𝐚𝐫𝐧 𝐢𝐧 𝟐𝟎𝟐𝟮: 🤍 ⏩𝐓𝐨𝐩 𝟏𝟎 𝐇𝐢𝐠𝐡𝐞𝐬𝐭 𝐏𝐚𝐲𝐢𝐧𝐠 𝐉𝐨𝐛𝐬 𝐅𝐨𝐫 𝟐𝟎𝟐𝟐: 🤍 ⏩𝐓𝐨𝐩 𝟏𝟎 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐢𝐧𝐠 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 𝐟𝐨𝐫 𝟐𝟎𝟐𝟐: 🤍 ⏩𝐓𝐨𝐩 𝟏𝟎 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 𝐟𝐨𝐫 𝟐𝟎𝟐𝟐: 🤍 📌𝐓𝐞𝐥𝐞𝐠𝐫𝐚𝐦: 🤍 📌𝐓𝐰𝐢𝐭𝐭𝐞𝐫: 🤍 📌𝐋𝐢𝐧𝐤𝐞𝐝𝐈𝐧: 🤍 📌𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦: 🤍 📌𝐅𝐚𝐜𝐞𝐛𝐨𝐨𝐤: 🤍 📌𝐒𝐥𝐢𝐝𝐞𝐒𝐡𝐚𝐫𝐞: 🤍 📌𝐂𝐚𝐬𝐭𝐛𝐨𝐱: 🤍 📌𝐌𝐞𝐞𝐭𝐮𝐩: 🤍 📌𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐭𝐲: 🤍 Please write back to us at sales🤍edureka.co or call us at IND: 9606058406 / US: 18338555775 (toll-free) for more information.

Best Demonstration Of | Primary Key | Foreign Key | Composite Key | Candidate Key | Unique Key .

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Keys are very important part of Relational database. They are used to establish and identify relation between tables. Types of keys in DBMS. Primary Key – A primary is a column or set of columns in a table that uniquely identifies tuples (rows) in that table. ... Composite Key – A key that consists of more than one attribute to uniquely identify rows (also known as records & tuples) in a table is called composite key. What is the Difference between a Primary Key and a Foreign Key?, Primary and Foreign Key Constraints, Primary and Foreign Key rules, Definition of primary, super, foreign and candidate key in the DBMS, Defining primary key–foreign key relationships, Can you use a foreign key as a primary key?, What is the difference between a primary key and foreign key in a database? , What is the difference between primary key foreign key and composite key?, Can a column be a primary key and a foreign key?, primary key and foreign key examples, primary key and foreign key definition, difference between primary key and unique key with example, difference between primary key and candidate key, how to make a foreign key, how to make a composite key, how to identify composite key, how to identify foreign key, how to identify primary key, Database concept for beginners, dbms for beginners, introduction to database for beginners, introduction to database keys for beginners, how to find candidate keys, how to find composite keys

21. What is the Difference Between Primary Key and Unique Key?

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#Primary_and_Unique_Key What is the Difference Between Primary Key and Unique Key

What is the difference between Primary key and Unique key ?

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Unique key constraint - Part 9

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In this video we will learn 1. What is unique key constraint 2. When do you use unique key constraint over primary key constraint 3. Difference between unique key constraint and primary key constraint Text version of the video 🤍 Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help. 🤍 Slides 🤍 All SQL Server Text Articles 🤍 All SQL Server Slides 🤍 All Dot Net and SQL Server Tutorials in English 🤍 All Dot Net and SQL Server Tutorials in Arabic 🤍

Create primary key Using phpmyadmin || Difference between Primary key and Unique Key

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So, this video demonstrates the process of creating primary key in phpmyadmin. Also the difference between primary key and unique key is explained.

What is the Difference between Primary Key and Unique Key - Database

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For database related videos, please subscribe channel 🤍 What is the Difference between Primary Key and Unique Key - Database Primary Key:- A primary key constraint is a column or group of columns in a table that uniquely identifies every row in that table. The Primary key can't be a duplicate, meaning the same value can't appear more than once in the table. Unique Key:- A unique key is a group of one or more than one fields or columns of a table which uniquely identify database record.

CONSTRAINTS IN SQL || PRIMARY KEY || NOT NULL || DEFAULT || CHECK || UNIQUE || FOREIGN KEY || DBMS

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Excel How to Create a Unique ID or Primary Key Using IF Function

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How to Create a Unique ID or Primary Key Using IF and ROW Functions | Excel Tagalog Tutorial Nowadays, creating a unique ID or primary key in Excel is relatively easy if you know how to use the Query editor or PowerQuery in Excel. However, if your current version does not support this or you don't have an idea on how to do this, you may find yourself thinking of doing this using a formula. In this video, you will learn how to create your own primary key using the combination of several functions primarily the IF and ROW functions. There are several formats that you can choose from to suit your requirement. 1. Incrementing number Ex. 1, 2, 3, 4 etc. 2. Incrementing primary key (formatted as "000") Ex. 001, 002, 003 etc. 3. Student number which is based on year and semester joined Ex. 2020-1-000001, 2020-1-000002, 2020-1-000003 etc. 4. Varying client id depends on the destination Ex. CAN001, CAN002, NEW001, NEW002, AUS001 etc. To learn how you can apply this, please watch the video. Download Practice File 🤍 “Ultimately what you do is secondary. But how you do it is primary.” - Eckhart Tolle * Want to learn more about Excel? SUBSCRIBE NOW: 🤍 YouTube Playlist: 🤍 Or visit me on Facebook at 🤍 See you there! Romeo Costillas Microsoft Certified Solutions Associate BI Reporting Microsoft Office Specialist Master Microsoft Office Specialist Excel Expert "To EXCEL in the workplace, one must know how to use excel!" - Romeo Tagalog Excel | Filipino | Pinoy Excel | Excel Tutorial | Excel Tagalog Tutorial #excel #microsoftexcel #excelbyromeocostillas #excelonline #exceltraining #excelfreetraining #excelmasterclass #tagalogexcel #excelpinoy

Primary Key Foreign Key Tutorial

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#PrimaryKey #ForeignKey #DatabaseTutorial #EasyDatabaseTutorial Primary Key Foreign key tutorial

16 Create Table with Primary Key and Unique Constraint

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Hello everyone, This video shows how to create table with PRIMARY KEY and UNIQUE constraint. Follow me on linkedin:🤍 Join CloudAndDataUniverse group on Telegram: 🤍 Other playlists in channel:- SQL Playlist in Hindi:- 🤍 AZURE Playlist in English:- 🤍 AZURE Playlist in Hindi:- 🤍 Azure Data Factory Playlist in English:- 🤍 Azure Data Factory Playlist in Hindi:- 🤍 Databricks Playlist:- 🤍 Python programming Playlist in English:- 🤍 Python programming Playlist in Hindi:- 🤍 Scala Playlist in English:- 🤍 Scala Playlist in Hindi:- 🤍 POWER BI Playlist in English:- 🤍 POWER BI Playlist in Hindi:- 🤍 EXCEL Playlist in English:- 🤍 EXCEL Playlist in Hindi:- 🤍

Fix: SQL Primary Key Constraint; Cannot inset duplicate key in object in SQL SERVER

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Error Message: Violation of PRIMARY KEY Constraint; Error Message: Violation of PRIMARY KEY Constraint Cannot inset duplicate key in object

DIFFERENCE BETWEEN PRIMARY KEY AND CANDIDATE KEY IN DBMS WITH EXAMPLE

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Watch the video to understand the difference between primary key and candidate key in dbms with examples.

Difference between Primary Key and Unique Key | Primary key Vs Unique Constraint | Composite Key

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This channel would provide new vidoes on SQL, ETL and Data warehouse concepts. Please do subscribe my channel and drop me an email if you need any help or if you have any SQL doubts. *Logical Processing of SELECT Statement | Logical execution of SELECT Statement- see full video please click the link - 🤍 I would create a separate play list for SQL Tutorials for beginners, advanced concepts, Interview questions and data warehousing concepts Feel free to drop me an email at sql.ravimartha🤍gmail.com in case of any queries you have in SQL or clarifications on the videos I have done. Blog: 🤍 Facebook Page: 🤍 🤍 Youtube Channel: 🤍 #SQLWithRaviMartha #SQL

PRIMARY KEY vs UNIQUE KEY vs FOREIGN KEY - Part 1 | PRIMARY KEY CONSTRAINT | KEY vs INDEX

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PRIMARY KEY vs UNIQUE KEY vs FOREIGN KEY - Part 1 | PRIMARY KEY CONSTRAINT | KEY vs INDEX PRIMARY KEY vs UNIQUE KEY | PRIMARY KEY vs FOREIGN KEY | PRIMARY KEY Constraint vs UNIQUE KEY Constraint | PRIMARY KEY Constraint vs FOREIGN KEY Constraint | Index vs Key | Unique Key vs Unique Index | Unique Clustered Index | Non-clustered index | Composite key | Candidate key | Alternate key | HEAP in SQL | Key vs Index | WITH CHECK vs WITH NO CHECK FOREIGN KEY Constraint | Non-clustered PRIMARY KEY | Clustered Unique Key | PRIMARY KEY vs UNIQUE KEY vs FOREIGN KEY | PRIMARY KEY Constraint | UNIQUE KEY Constraint | FOREIGN KEY Constraint | PRIMARY KEY क्या होती है प्राइमरी की क्या होती है Agenda: QA. What is the difference between PRIMARY KEY and UNIQUE KEY? QB. What is the difference between PRIMARY KEY and FOREIGN KEY? QC. What is the difference between INDEX and KEY? Q01. What is the difference between PRIMARY KEY and Non-Nullable UNIQUE KEY? Q02. What is the difference between the PRIMARY KEY and Unique Clustered Index? Q03. How many NULL values are allowed in a PRIMARY KEY column? Q04. Can a PRIMARY KEY Contains an empty(blank) value or whitespace? Q05. Can the PRIMARY KEY columns contain duplicate values? Q06. Can you add a clustered index on any column in SQL? Q07. Is it mandatory for a PRIMARY KEY to be clustered index? Can a PRIMARY KEY have a non-clustered index? Q08. Can you create a PRIMARY KEY on a table that has already a clustered index? Q09. Can you add both clustered and non clustered indexes on a column? Q10. If a column contains a clustered index, is it mandatory that the column must be PRIMARY KEY also? Q11. Can you add both clustered and non-clustered indexes on the same column of the database? Q12. Can you add multiple PRIMARY KEY or clustered indexes on any table? Q13. Can you create a PRIMARY KEY on the temp table? Q14. Can you add a PRIMARY KEY on view? Q15. What is the difference between table level and column level PRIMARY KEY? Q16. When the database is in first normal form (1NF)? Q17. Can you update or delete the PRIMARY KEY value of a table? Q18. Can you add the PRIMARY KEY constraint on a column that contains data? Q19. What is IAM (Index Allocation Map) Page in SQL? Q20. What is a composite key? Q21. What is a candidate key? Q22. What is an alternate key? Q23. Can you add a PRIMARY Key constraint on a nullable column? Q24. How many PRIMARY KEYs are allowed in a table? Q25. How many clustered indexes are allowed in any table? Q26. Can you DROP the index created by the Primary Key? Q27. How can you DROP the Primary Key CONSTRAINT? Q28. Can you make a varchar(max) column as PRIMARY KEY in SQL? Q29. Is it mandatory to make the PRIMARY KEY column an identity column? What will happen if two users will try to add the same value in PRIMARY KEY at the same time? Q30. If you have clustered index already on a column i.e. UserName in a table, Now you have to create a PRIMARY KEY on the UserId column. How will you do that? Q31. In which order the data will be displayed by default if execute the select command on the table without any order by clause? Q32. Why PRIMARY KEY enforces it to be non-nullable and UNIQUE KEY as Nullable? Q33. What is a HEAP in SQL? Subscribe to our YouTube Channel: 🤍 Visit our Website for more Articles: 🤍 Recommended Videos Playlists: MVC videos Playlist: 🤍 SQL Videos Playlist: 🤍 C# Interview Questions and Answers Videos Playlist: 🤍 Visual Studio Tips and Tricks Videos Playlist: 🤍 Interview Questions and Answers Videos Playlist: 🤍 C# Videos Playlist: 🤍 C# 8 Videos Playlist: 🤍 Recommended SQL Videos: ROW_NUMBER() vs RANK() vs DENSE_RANK() video: 🤍 CTE video: 🤍 Recommended C# Interview Questions Videos: Sealed Class Interview QA Video: 🤍 Static Class Interview QA Video: 🤍 Abstract Class vs Interface Video: 🤍 Follow Us on Social Media Platforms: Follow us on Facebook: 🤍 Follow us un WhatsApp group: 🤍 Follow us on LinkedIn: 🤍 Follow us on Telegram: 🤍

What is the difference between the primary key and unique key in SQL Server

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19.05.2022

What is the difference between the primary key and the unique key in SQL Server? Unique Key : 1) It will not allow duplicate values in a column 2) It allows only one null value 3) You can create multiple Unique key on the table Ex : Table1 you can create UniqueKey1,UniqueKey2.. Primary Key : 1) It does Not allow null values and Duplicate values 2) You can create only one primary key on the same table Ex: Table1 you can create PrimaryKey1, PrimaryKey2(It is not allowed ) Example : Create table Emp ( ID int,EmpNo int,Empname varchar(10),salry int, constraints PK_Emp_ID,EMpNo Primary key (ID,Empno) ) 3) It's create a one clustered Index on table

Difference Between Primary Key and Unique key constraint SQL Server (ssms) 2012

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23.07.2019

#primarykey #uniquekey SQL Server Difference between Primary key and unique key constraint with example

PRIMARY KEY vs UNIQUE KEY vs FOREIGN KEY-Part 2 | UNIQUE KEY CONSTRAINT | UNIQUE KEY vs UNIQUE INDEX

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06.08.2021

PRIMARY KEY vs UNIQUE KEY vs FOREIGN KEY - Part 2 | UNIQUE KEY CONSTRAINT | UNIQUE KEY vs UNIQUE INDEX PRIMARY KEY vs UNIQUE KEY, PRIMARY KEY vs FOREIGN KEY, PRIMARY KEY Constraint vs UNIQUE KEY Constraint, PRIMARY KEY Constraint vs FOREIGN KEY Constraint, Index vs Key, Unique Key vs Unique Index, Unique Clustered Index, non-clustered index, composite key, candidate key, alternate key, HEAP in SQL, Key vs Index, WITH CHECK vs WITH NOCHECK FOREIGN KEY Constraint, Non-clustered PRIMARY KEY, Clustered Unique Key, PRIMARY KEY vs UNIQUE KEY vs FOREIGN KEY, PRIMARY KEY Constraint, UNIQUE KEY Constraint, FOREIGN KEY Constraint Agenda: - QA. What is the difference between PRIMARY KEY and UNIQUE KEY? QB. What is the difference between PRIMARY KEY and FOREIGN KEY? QC. What is the difference between UNIQUE KEY and UNIQUE INDEX? Q01. What is the difference between UNIQUE Constraint and UNIQUE INDEX in SQL? Q02. If the primary key uniquely identified rows, then why bother about UNIQUE KEY? Q03. Is NUll value allowed in the UNIQUE KEY column? Q04. Can a UNIQUE KEY contain an empty(blank) value or whitespace? Q05. Can you make the UNIQUE KEY column an identity column? Q06. Can you create a UNIQUE KEY constraint on a PRIMARY KEY column? Q07. Which type of index created by default for the UNIQUE KEY constraint? Q08. If you DROP the UNIQUE constraint, does it also drop the UNIQUE index? Q09. Can you add clustered Unique Index in any table? Q10. Can you use UNIQUE KEY as a replacement for PRIMARY KEY? Q11. Is it mandatory for a UNIQUE KEY to being a NonClustered index? Can a UNIQUE Key be created on Clustered Index? Q12. Can you add the UNIQUE KEY constraint on a column that contains data already? Q13. Can you update or delete the UNIQUE KEY value of a table that is referenced by the foreign key? Q14. Can you make a varchar(max) column as UNIQUE KEY in SQL? Q15. If you have to store the data in such a way that each and every record can be identified by a unique value. What will be your approach PRIMARY KEY or Unique Key? Q16. If a NULL value never equals another NULL value, it means they are unique, then why only one NULL value is allowed in a UNIQUE key column? Subscribe to our YouTube Channel: 🤍 Visit our Website for more Articles: 🤍 Recommended Videos Playlists: MVC videos Playlist: 🤍 SQL Videos Playlist: 🤍 C# Interview Questions and Answers Videos Playlist: 🤍 Visual Studio Tips and Tricks Videos Playlist: 🤍 Interview Questions and Answers Videos Playlist: 🤍 C# Videos Playlist: 🤍 C# 8 Videos Playlist: 🤍 Recommended SQL Videos: Primary Key video - 🤍 ROW_NUMBER() vs RANK() vs DENSE_RANK() video: 🤍 Recommended C# Interview Questions Videos: Sealed Class Interview QA Video: 🤍 Static Class Interview QA Video: 🤍 Abstract Class vs Interface Video: 🤍 Recommended C# Videos: Abstract Class and Methods video: 🤍 Sealed Class Video: 🤍 Static Class Video: 🤍 Follow Us on Social Media Platforms: Follow us on Facebook: 🤍 Visit our Facebook Page: 🤍 Follow us un WhatsApp group: 🤍 Follow us on LinkedIn: 🤍 Follow us on Telegram: 🤍 Follow us on VK: 🤍 Follow us on Twitter: 🤍 Follow us on Pinterest: 🤍 Follow us on Instagram: 🤍 Follow us on Mix: 🤍 Follow us on Tumblr: 🤍

SQL Tutorials - 6.Constraints - Primary key / Unique Key / Foreign Key

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23.04.2019

In this tutorial we will learn how to create a keys and how they are useful for us PRIMARY KEY constraint : uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. The UNIQUE constraint : ensures that all values in a column are different and it's allow one NULL value. FOREIGN KEY : is a key used along with Primary Key to link two tables together and the table with Foreign key called Child table and with Primary key called Parent table. Last but not the least, SUBSCRIBE to my YouTube channel to stay updated about the regularly uploaded new videos. Linkedin : 🤍

Primary Key VS Foreign Key

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Do you know difference between Primary Key (PK) and Foreign Key (FK)? Watch this video to find out!

Primary key and Surrogate key in DATABASE

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06.05.2020

Primary key and Surrogate key #database

SQL Interview Question # 6 - What is the difference between Primary Key and Unique Key

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28.05.2020

In this video session, I have provided the answer for one of the SQL Interview Questions - What is the difference between Primary Key and Unique Key

Key Differences Between Primary Key & Unique Key | SQL Tutorial For Beginners - Part 15

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13.09.2022

In this video I have explained key differences between PRIMARY Key & UNIQUE Key in sql server. A table can have one & only one Primary Key but can have more than one Unique key. Primary Key can't accept NULL values. Unique key can accept Null value but once. Video Link: 🤍 ................................................................................................................. Sql tutorial videos playlist: 🤍 What is Primary Key What is Unique Key Primary Key Vs Unique Key Key Difference Between Primary Key & Unique Key SQL tutorial for beginners SQL tutorial in Hindi SQL Full Course Like, Share, Support, and Subscribe!!! Channel Link: 🤍 🤍UniversalIndresh Thanks!

Primary Key Example - Key Fields and Foreign Keys

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06.02.2014

Primary Key Example - Key Fields and Foreign Keys In this video I answer a question from a student learning SAP ABAP from the course Beginners Guide To ABAP at 🤍 The question goes like this: What is the importance of Key Fields and Foreign Key Key Fields come in a few different forms: A Table KEY - Is the Primary Key and it Identifies unique records in the table. A Foreign Key - Used to link multiple tables together - They don't have to be unique - They point to unique values in reference tables (most of the time) Videos in the series: Learn SAP ABAP - Video Playlist - 🤍 Websites and Profiles: SAP Training Courses 🤍 SAP Academy Courses 🤍 SAP Training on Twitter: 🤍 SAP Training on Google + 🤍 STHQ on Linked-In 🤍 STHQ on YouTube 🤍 More SAP Resources: SAP site 🤍 SAP community netwrok 🤍 About SAP 🤍 About ABAP 🤍 Various YouTube channels on SAP: SAP InnoJam 🤍 SAP on YouTube 🤍 SAP TV on YouTube 🤍 SAP SCN on YouTube 🤍 🤍

Oracle Tutorials | Primary key & Foreign Key Reference key Relationship in Oracle | by Mr.Sudhakar L

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13.11.2018

Oracle Tutorials | Primary key & Foreign Key Reference key Relationship in Oracle | by Mr.Sudhakar L #Oracle #Tutorials #Videos For Online Training Registration: 🤍 ► Call: +91-8179191999 #OracleTutorials | #Primary_key_ForeignKeyReference ► Visit Our Website for Classroom Training: 🤍 ► For Online Training: 🤍 ► About NareshIT: "Naresh IT is having 14+ years of experience in software training industry and the best Software Training Institute for online training, classroom training, weekend training, corporate training of Hadoop, Salesforce, AWS, DevOps, Spark, Data Science, Python, Tableau, RPA ,Java, C#.NET, ASP.NET, Oracle, Testing Tools, Silver light, Linq, SQL Server, Selenium, Android, iPhone, C Language, C, PHP and Digital Marketing in USA,Hyderabad, Chennai and Vijayawada,Bangalore India which provides online training across all the locations ► Our Online Training Features: 1.Training with Real-Time Experts 2.Industry Specific Scenario’s 3.Flexible Timings 4.Soft Copy of Material 5. Share Videos of each and every session. Please write back to us at us.training🤍nareshit.com/online🤍nareshit.com or Call us at USA: +1404-232-9879 or India: +918179191999 Check The Below Links ► For Course Reg: 🤍 ► Subscribe to Our Channel: 🤍 ► Circle us on G+: 🤍 ► Like us on Facebook: 🤍 ► Follow us on Twitter: 🤍 ► Follow us on Linkedin: 🤍 ► Follow us on Instagram: 🤍

Primary Key in SQL/Oracle (Primary key, Unique key and Not Null Key)

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30.12.2019

For more details you can refer the blog link: 🤍 In this Playlist I am uploading all the videos which help you to learn the SQL, PLSQL and improve your skills. If you have any doubt's you can write in comment section. Please like, share and Subscribe the channel to get latest videos. 1. Primary Key, Unique key and Not Null: Example: CREATE TABLE emp_demo ( emp_id NUMBER, emp_name VARCHAR2(100) NOT NULL, salary NUMBER, PRIMARY KEY (emp_id) );

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