I have the following situation.
table looks like this
CREATE TABLE CompetitionsLanguages (
competition REF CompetitionType SCOPE IS Competitions,
language REF LanguageType SCOPE IS Languages
);
I need this table to have a unique constraint on (competition,language) combination. oracle tells me that i cant put a UNIQUE or PK on columns that reference other tables.
is it possible to somehow avoid the unique, using the CHECK, or some sort of a TRIGGER?
CREATE UNIQUE INDEX unqIndex
ON CompetitionsLanguages(CompetitionsLanguages, CompetitionsLanguages);
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