Web Reference: Jan 16, 2026 · Msg 3723 arises because SQL Server blocks index drops when they are referenced by enabled foreign key constraints. Disabling the index alone doesn’t resolve the issue—you must first disable or drop the dependent FK constraint. Jul 17, 2014 · Dropping the index would break this consistency, so you have no other choice than dropping the related foreign keys first and then the index. You won't be able to re-create the other foreign keys until you stablish another primary key or unique for this same reason. Nov 18, 2025 · The DROP INDEX statement doesn't apply to indexes created by defining PRIMARY KEY or UNIQUE constraints. To remove the constraint and corresponding index, use ALTER TABLE with the DROP CONSTRAINT clause.
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