Keisuke Miyako, 4D iNug Technical, 18 Sep 2015

Just to be clear, a UUID field is not string,
so the „@“ will not work as a wildcard in comparison.
(it will simply be considered a literal „@“ sign)

the following will yield nothing: (exception below)
QUERY ([Table_1];[Table_1]UUID=“@“)

but the following will return everything:
QUERY ([Table_1];[Table_1]UUID#“@“)

because you can’t have an „@“ sign stored in a UUID field.

well, to be precise, a UUID is compared against the hexadecimal UTF-8 code point sequence,
so technically the following UUID will match „@“