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

Does oracle partitioning improve performance?

1053

How to set up autotrace for a user account?

1118

How to rename a column in an existing table?

1090

How to do clean up if create database failed?

1074

How to define a specific record type?

1142

What is the database name in oracle?

1083

What is the relation of a user account and a schema?

1183

How to use attributes of the implicit cursor in oracle?

1068

What is a Garbage Collection? and what is full recursive Garbage collection?

2961

Point the difference between translate and replace?

1152

what is the scripts in data base?

2224

What is the difference between view and materialized view in Oracle?

1208

Can you tell me how to add new column in existing views?how?How is possible?

1519

What is oracle host variable?

1139

How can you tell how much space is left on a given file system and how much space each of the file systems subdirectories take-up?

2877