Stretch your deck or patio dining space by adding these built-in DIY tables directly to your deck posts to supplement outdoor furniture. You can adapt the height to eat standing or seated on an outdoor stool or chair.
walk out basement under deck designs - Google Search
I wish the guy wasn't in the picture, but it clearly shows the construction for making your own pillars. I like the style.
How to Install a Deck Post | Ask the Builder
AsktheBuilder - EXCELLENT first article!!! How to Install a Deck Post | Ask the Builder
12 DIY Concepts for Patios, Porches and Decks
If your deck is built at higher elevations, you should definitely consider under deck lattice, post covers, wraps or sleeves to hide the posts.
A bit more of an Alpine look but still looking afordable...
Add dining space for large groups by attaching tables to deck supports posts. --Lowe’s Creative Ideas