is Mysql relational database i have forigen key in my tables..............
if yes please tell me how can i do it?
yes, to a certain extent, mysql is a RDMS.
I'm not too sure what your question is though.
can i have forigen keys in my tables when i use MySql database
Read: http://www.mysql.com/doc/en/ANSI_diff_Foreign_Keys.html
You can have fks with innodb tables, but you do not get cascading deletes etc... just simple fk constraint. I think the cascading deletes are "on their way."