There are questions requesting and suggesting a mark-down to create database tables / table formatter featues in the post editor panel. It seems these features are still under consideration. My suggestion is different yet supports the above requests.
So can we perhaps add a mechanism in SO to encourage users to include a sample table schema (CREATE, INSERT commands) within code snippet or a link such as SQLFiddle?
By doing so, user is providing claffication and required background info for his/her question. Which is crucial, specially in SQL perspective.
E.g. New tag is mainly focus on user's specific sql database/table queries and not general to all sorts of sql questions. So when questions are tagged using this particular tag, user is required to include their table schema in the question.
This is just a suggestion only. If can achieve, that's helpful as we encounter poor table descriptions, no table descriptions at all in the related questions.