I don’t know about you, but my brain doesn’t seem to remember all the different commands such as truncation symbols for commonly used databases. To aid myself and hopefully to help you, I’ve compiled a table of common commands and posted them on the Reference Wiki. The page is called “Database Command Cheatsheet” and can be viewed here: https://www.baruch.cuny.edu/confluence/display/lib/Database+Command+Cheatsheet
Please feel free to add to this list.
This is great! By the way, there is already a long entry in the wiki on proximity searching. I linked to it from the page you created.