+ 1

Difference between primary key and Foriegn Key

what is the simple understandable answer for difference between primary key and secondary key.

9th Jul 2018, 9:42 AM
Subham Keshari
Subham Keshari - avatar
2 odpowiedzi
+ 4
Primary Key: identify uniquely every row it can not be null. it can not be a duplicate. Foreign Key: create relationship between two tables. can be null. can be a duplicate   Hope it helps :D
9th Jul 2018, 10:06 AM
Jerome Esplana
Jerome Esplana - avatar
0
write new ansewar
17th Jul 2018, 2:11 PM
shene