Interested to Buy Any Domain ? << Click Here >> for more details...
what is the difference between primary key & foreign key?
- 57 Answers
- 137587 Views
- CTS, Infosys, La Multi, Sparsh, Wipro, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / anil bharodiya
Primary key is field of the table that can be used to
uniquely identify records of the table
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / sripathi venkata ramesh
I am Sripathi Venkata Ramesh from Gudivada and the answer
is mentioned below
Primary key: A Primary key is a column or group of columns
used to uniquely identify each row in a table like
It defines the column as a Mandatory column.
The data held across the column must be unique.
By default it creates clustered index.
It does not allow null values and duplicate values
Foreign key: A Foreign key is a column or group of columns
whose values are derived from the primary key of some other
table
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / bharathi sundar
A PRIMARY KEY DOES NOT ACCEDES DUPLICATIONS .
A FOREIGN KEY IS USED FOR LINKING TWO DATABASE TABLES
ABSTRUSELY .
A FOREIGN KEY USES THE PRIMARY KEY IN ANOTHER TABLE,
TO RETRIEVE OR TO IDENTIFY THE CELL VALUES IN ANOTHER
TABLE.........
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / sravan kumar
A attribute which it is uniquely identifies in a row in a
table is called Primary key..
A column in a table whose values matches the primary key in
some other table is called Foreign key
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / raja
foriegn key always refers to
primary key but Primary key is unique key
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / suneel manne
Primary key is a key it will allow only Unique values and
avoid duplicate values and foreign key is a reference key
from the other table, So here primary key acts as a parent
key and foreign key acts as a child key.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / ibrahim
A primary key is an combination of attributes that uniquely
identifies each row in a relation. A primary key is
designated by underlining the attribute name. The primary
key of an entity set allows us to distinguish among the
various entities of the set.
A foreign key is an attribute in a relation of database
that serves as the primary key of another relation in the
same database.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / kush kaushik
Primary key is primary means from india and foreign key is forgeiner means from forign .. ..By kush kaushik(kush.kaushik87@gmail.com)
| Is This Answer Correct ? | 0 Yes | 1 No |
how many types of index?
Which Oracle App Is Most Popular One ?
How to create a new table by selecting rows from another table?
How to download oracle database 10g xe?
How do I limit the number of oracle database connections generated by weblogic server?
What is translate in oracle?
How to compare dates in oracle sql?
How to write text literals in oracle?
Explain mutating triggers.
What is Java Pool in Oracle?
What is the quickest way to fetch the data from a table?
How to define an oracle cursor variable?
Oracle General 
