Unique constraint with defined value?

You can create a unique function-based index and leverage the fact that Oracle does not index NULL values in b-tree indexes.

You can create a unique function-based index and leverage the fact that Oracle does not index NULL values in b-tree indexes. CREATE UNIQUE INDEX one_active_guid ON table_name( (CASE WHEN is_active = 'Y' THEN guid ELSE null END) ).

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