Ooh, didn't know about this one. Very nice.

> Determines which letter case to use when completing an SQL key word. If set to lower or upper, the completed word will be in lower
> or upper case, respectively. If set to preserve-lower or preserve-upper (the default), the completed word will be in the case of the
> word already entered, but words being completed without anything entered will be in lower or upper case, respectively.