[ComodoHacker]

I'm not sure a procedural visualization is appropriate for a declarative language like SQL. It can be misleading both on underlying concepts (sets and relations) and actual query execution.

I'd more like to see a visualization it terms of tuples, sets and operations on them leading to result set.

[rockostrich]

I guess this could be a teaching tool if you focus on just selecting keywords from the dropdown, but in general most SQL engines' EXPLAIN features are leagues more useful than this.

[bvm-101]

Idea was to supplement the many websites that do explain SQL this way. But yes, I agree with that statement.