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.
Answer Posted / g priya
If a field is null the database engine makes the field to be 0
if not null is specified ,field must be given a value
Primary key is unique,not null,index where as Unique key has
1 null value
| Is This Answer Correct ? | 2 Yes | 5 No |
Post New Answer View All Answers
How do you name a table?
Do while loop in mysql procedure?
write a query to mysql in safe mode and to change the root password
How to do login in mysql with unix shell.
What is the use of mysqli_num_rows?
What is “i_am_a_dump” flag in mysql?
Is mysql a dbms?
Does mysql use sql?
How will you export tables as an xml file in mysql?
How can you retrieve a portion of any column value by using a select query?
What is regex in mysql?
What are the different data types in mysql?
Can you tell the difference between mysql_connect and mysql_pconnect? : Mysql dba
What is mysql_connect?
What language is used in mysql?