Golgappa.net | Golgappa.org | BagIndia.net | BodyIndia.Com | CabIndia.net | CarsBikes.net | CarsBikes.org | CashIndia.net | ConsumerIndia.net | CookingIndia.net | DataIndia.net | DealIndia.net | EmailIndia.net | FirstTablet.com | FirstTourist.com | ForsaleIndia.net | IndiaBody.Com | IndiaCab.net | IndiaCash.net | IndiaModel.net | KidForum.net | OfficeIndia.net | PaysIndia.com | RestaurantIndia.net | RestaurantsIndia.net | SaleForum.net | SellForum.net | SoldIndia.com | StarIndia.net | TomatoCab.com | TomatoCabs.com | TownIndia.com
Interested to Buy Any Domain ? << Click Here >> for more details...

  1. Categories >> Software >> Databases >> SQL PLSQL
  2. Suggest New Category

What is a primary key, and how is it different from a unique key?

Question Posted / nashiinformaticssolutions

Answers were Sorted based on User's Feedback



What is a primary key, and how is it different from a unique key?..

Answer / nashiinformaticssolutions

• Primary Key:
o Ensures each row in a table is unique.
o Cannot contain NULL values.
o A table can have only one primary key.
• Unique Key:
o Ensures all values in a column are unique.
o Can contain a single NULL value.
o A table can have multiple unique keys.

Is This Answer Correct ?    0 Yes 0 No

What is a primary key, and how is it different from a unique key?..

Answer / glibwaresoftsolutions

• Primary Key:
o Ensures each row in a table is unique.
o Cannot contain NULL values.
o A table can have only one primary key.
• Unique Key:
o Ensures all values in a column are unique.
o Can contain a single NULL value.
o A table can have multiple unique keys.

Is This Answer Correct ?    0 Yes 0 No

What is a primary key, and how is it different from a unique key?..

Answer / hr@tgksolutions.com

• Primary Key:
o Ensures each row in a table is unique.
o Cannot contain NULL values.
o A table can have only one primary key.
• Unique Key:
o Ensures all values in a column are unique.
o Can contain a single NULL value.
o A table can have multiple unique keys.

Is This Answer Correct ?    0 Yes 0 No

Post New Answer

More SQL PLSQL Interview Questions

In a Distributed Database System Can we execute two queries simultaneously ? Justify ?

3 Answers  

What are the different types of dbmss?

0 Answers  

What is localdb mssqllocaldb?

0 Answers  

Can instead of triggers be used to fire once for each statement on a view?

0 Answers  

Explain the update statement in sql

0 Answers  

what is sub-query? : Transact sql

0 Answers  

Can you inner join the same table?

0 Answers  

What is the location of pre_defined_functions.

0 Answers  

In packages the source code is compiled into p code ? how do we describe the p code

3 Answers  

How many types of indexes are there in sql?

0 Answers  

How to execute OS(operating system) command from pl/sql?

3 Answers  

Are null values same as that of zero or a blank space?

0 Answers  

For more SQL PLSQL Interview Questions Click Here
Categories