There already is a syntax like this. You can do: CASE boolean_expression WHEN TRUE THEN whatever WHEN FALSE THEN whatever ELSE whatever END
Besides, sad, there's no such thing as a tri-valued boolean.
You either have a boolean(with a true/false value) or a NULL, which is something completely different and it's _not_ one of the two _values_ that a boolean object takes. I think you're looking at this completely wrong. If in Java you receive a Boolean object instance, will you start claiming that that Java has tri-valued booleans, and the "if" should account for that ?!
You can think of values in plpgsql as wrapper objects that carry a value and have a "is_null" flag; I have no idea how they're implemented in PostgreSQL or in any RDMBS in general but this should do it, at least for a naive implementation.
Peace, -- Radu-Adrian Popescu CSA, DBA, Developer Aldrapay MD Aldratech Ltd. +40213212243
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