Primary Key = unique + Not null Because primary key is used to uniquely id

"primary key=unique+null" is equal,reson?not,reason?

Question Posted / prashant

Answer Posted / prashant

Primary Key = unique + Not null
Because primary key is used to uniquely identify each row
of the table.

Is This Answer Correct ?

9 Yes

0 No

Please Help Members By Posting Answers For Below Questions

What is an oracle data file?

1039

Explain what are synonyms used for?

983

Can select statements be used on views in oracle?

985

what is dynamic SGA and static SGA

4330

What is a connect identifier?

983

In XIR2 if we lost the administration password .How can we regain the password?thanks in advance.

1870

What is data file?

1045

Explain the importance of .pll extension in oracle?

956

What is oracle thin client?

974

How to write a query with an inner join in oracle?

976

what is difference between sql plus and sql*plus? (not sql and sql plus).

3814

Please send me Informatica 8.1 certification dumps, my mail id mona85gupta@gmail.com

1810

What is integrity and what is constraint??Explain with example

2215

How to rebuild an index in oracle?

976

How many types of tables are there in oracle?

1008