Interested to Buy Any Domain ? << Click Here >> for more details...
What is the diff. bwt. primary key and unique key?
- 4 Answers
- 6192 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / janhvee
diff. between primary key and unique is unique key can be
null but primary key can't be null.
one table can have only one primary key but unique key can
be multiple keys
| Is This Answer Correct ? | 17 Yes | 0 No |
Answer / rakesh ranjan
IN PRIMARY KEY IS ONLY IN ANY TABLE BUT WHEN WE TALKING
ABOUT UNIQUE KEY, IT CAN BE NULL.
| Is This Answer Correct ? | 5 Yes | 1 No |
primary is not allow null value.but unique can be allow null
value
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / sonu kumar
primary of any table can't be null but unique can be
primary key may be a unique key but unique can't be a primary key b/c primary key of any relation cant be a null value
| Is This Answer Correct ? | 0 Yes | 0 No |
What are the different mysql database engines?
How to Change a users password from unix shell.
Does mysql automatically index foreign keys?
What is strict mode in mysql?
Can you rename a database in mysql?
What happens if null values are involved in expressions?
Write command to import an mysql file?
What is the role of a limit in a mysql query?
What is meant by decimal (5,2)?
How do I copy an entire mysql database?
How to create a trigger in mysql?
What is the phantom problem?
-
Oracle (3259) - SQL Server (4518)
- MS Access (429)
- MySQL (1402)
- Postgre (483)
- Sybase (267)
- DB Architecture (141)
- DB Administration (291)
- DB Development (113)
- SQL PLSQL (3330)
- MongoDB (502)
- IBM Informix (50)
- Neo4j (82)
- InfluxDB (0)
- Apache CouchDB (44)
- Firebird (5)
- Database Management (1411)
- Databases AllOther (288)
