what are primary key and foreign key ?

Answer Posted / radha

Columns acting as a primary key will always hold unique
values.
Foreign key should always be a primary key of some table

Is This Answer Correct ?    1 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What are the features of database language?

543


How do I check my drivers?

477


What are different type of normalization?

542


what is the difference between two and three-tier architectures?

470


What is structure of dbms?

492






What is the importance of database in an organization?

458


What do you understand by ‘database’?

550


Explain ddl interpreter?

640


There are 100 datafiles, numbered from 1 to 100. File number 10 is deleted and it has 500 MB of data. The database is working in archive log mode. How can be the database recovered ? While doing recovery the archive logs applied are from nos 1 to 100, but 50 gets corrupted. What do we do? Can we proceed further? If so how?

1715


What is database join?

495


What do you mean by deadlock dbms?

545


What are different partitioning techniques in database?

467


Explain about the properties of cursors?

510


Define weak entity set.

607


Write a query to create a duplicate table with and without data present?

461