What is the difference between primary and unique key

Categories >> Software >> Databases >> MySQL
Suggest New Category

Question Posted / kamaltimalsina012

5 Answers
8259 Views
CSC, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

What is the difference between primary and unique key..

Answer / venkat rao

Unique key takes null value but primary key doesnot take
null value
primary key have properties of both null key and unique key
constraints

Is This Answer Correct ?

21 Yes

4 No

What is the difference between primary and unique key..

Answer / sudhanshu_kmr

.....primary key.......... unique key

at most one column .....:... any number of column

only unique values........... only unique values

don't accept null........... accept null

Is This Answer Correct ?

3 Yes

2 No

What is the difference between primary and unique key..

Answer / ashish asthana

Primay key restrict the duplicacy in the records and does
not accept null value or there are only one primary key in
a table

Unique constraint also restict the duplicacy but it accept
the null value one or more then one. We can apply unique
constraint more than one column

Is This Answer Correct ?

2 Yes

2 No

What is the difference between primary and unique key..

Answer / durai

primary key is does not allow duplicate which is contain not
null it is only once we can use in table

unique key allow null value

Is This Answer Correct ?

0 Yes

0 No

What is the difference between primary and unique key..

Answer / pradeep rajpoot

primary key no null value allow.
but unique key one null value is allow

Is This Answer Correct ?

0 Yes

4 No

Post New Answer