Getting custom database table content in posts

Hello to all

I’m relatively new to the wp programming world and I have a task in hands that after various searches seems impossible.

I need to get data from a external table to be display as a regular post (with the proper formatting) without using the wp-post table.

I managed to use the wpdb and get the data I needed but.. I only manage to show it on the admin board via plugin.

Can anyone point me a direction to this? Is this possible without importing data to wp?

Thanks