What is the difference between primary and unique key
Answer Posted / 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 |
Post New Answer View All Answers
What is database in php mysql?
Write a query to create a database and a table?
Is mysql relational?
How can you create and drop view in mysql?
What is indexing in mysql?
how to get only updated, deleted , inserted records after certain interval time in mysql with out using triggers...
What is different between sql and mysql?
write a query to mysql in safe mode and to change the root password
How do I copy a table in mysql?
Write a query to fetch duplicate records from a table using mysql?
can you tell what are the different set operations available in mysql? : Mysql dba
what is the difference between between and in operators in mysql?
Do I need to pay for mysql?
What is delimiter in mysql stored procedure?
What is back end and front end?