Merging Results of Queries

Hello guys I have a database system that has many databases and many tables on each database. I am trying to create a kind of search engine to seek data all over my database. I need to know if is possible to merge the results of my queries to later show them on a table or it is easier to perform the query and print the results on a HTML table leaving the table open, than perform another query and print it on.... until it is all over and close the table with </table>? Thank you Daniel F. Castro dfcastro@ig.com.br