which table i select?

can anyone tell me which table i select, so i backup only posts, pages,comments, category, and tags. in wp-dbmanager plug-in.

recently i backup my database from wp blog https://www.A.com and import it on mysql database of my another wp site https://www.B.com. the database change everything theme, plugins everthing even when i try to login – https://B.com/wp-login.php they redirect to https://A.com/wp-login.php