Web Reference: Nov 18, 2025 · Deleting a unique constraint removes the requirement for uniqueness for values entered in the column or combination of columns included in the constraint expression and deletes the corresponding unique index. Mar 31, 2011 · I think it is not possible in full SQL (but OK in script as proposed by @Rail). The best way is to copy the column to a new one, to set your constraints in the new column, to destroy the old one and then to rename the new column with the old column name. DROP CONSTRAINT The DROP CONSTRAINT command is used to delete a UNIQUE, PRIMARY KEY, FOREIGN KEY, or CHECK constraint.
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