In Oracle, constraints can be set up to enforce business rules on a database.
Sometimes you might want to remove constraints. To do this, use the ALTER TABLE command.
ALTER TABLE employeeDROP CONSTRAINT chk_emp_name; You’ll need to know the name of the constraint to do this. You can query the user_cons_columns view to find this:
SELECT *FROM user_cons_columnsWHERE table_name = 'your_table_name'; 
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