Interested to Buy Any Domain ? << Click Here >> for more details...
What is the main different between Null and NOT Null.
Difference between Primary and Unique Key.
How to Check the database from which application is it
possibe.
- 6 Answers
- 8902 Views
- I also Faced
- E-Mail Answers
Answer Posted / kalpana
Primary key can never be NULL.it is used to uniquely
identify the row in a table.The database engine requeir a
value to relocate the record.so Primary key can never be
NUL.unique key may be NULL.
| Is This Answer Correct ? | 21 Yes | 0 No |
Post New Answer View All Answers
List some comparisons operators used in mysql?
How do stored procedures work?
what is mySQL. Is there any specific qualification required to do this course ? What is the scope in India after doing mySQL
How many rows can mysql handle?
write a query to mysql in safe mode and to change the root password
What does the file with the extension: frm, myd, and myi contain?
What are triggers in mysql?
How to convert numeric values to character strings?
How to store values to array from mysql database in php?
Is mysql relational database?
What is the difference between truncate and delete?
What does innodb stand for?
What is the maximum number of records in mysql table?
How to create a table index in mysql?
change column name and make a unique column so we get no dupes.
