On Saturday 15 March 2003 04:08, vishnu mahendra wrote:
> create table stud(rno integer not null,
> name char(10),
> primary key(rno));
>
> create table mark(rno integer not null references
> stud,
> mark integer);

[skip]

> how is it possible.
> there is no rollno 3 in the stud table,
> then how does it accept the rollno 3 in the mark
> table.
> does foreign key really working,
> or i am doing something wrong.

REFERENCES do nothing in MySQL for all table types except InnoDB tables. How 
to use FOREIGN KEY CONSTRAINTS on InnoDB table look at:
        http://www.mysql.com/doc/en/SEC457.html

> how can i convert the default date format to the
> format
> 'dd-mm-yyyy'.

Use DATE_FORMAT() function:
        http://www.mysql.com/doc/en/Date_and_time_functions.html        

> or how can i insert the date in the format
> 'dd-mm-yyyy'.

You can't if you want to store as DATE/DATETIME column type.


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