First thought: How can values like 'AA' be found with LIKE '_' ?
Zero rows. Click. Zero points.
Next time I will wait for the caffeine to do its work. I learned something, hope I remember it when I need it. ;-)
I was surprised too. I watched it after one of my coworkers came with a question: "How it is possible, this query returned this data?" His pattern was little bit more complicated, something like '__[_]_[_][%'.
And the best point: I could write a question with "It depends" option:-)
See, understand, learn, try, use efficient