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Database - Interview Questions and Answers for 'Unique constraint' - 2 question(s) found - Order By Newest | ||||
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Ans. This error can result either on an insert, update or delete when any change in data results in duplicate record or subset of it having unique constraint on record or its subset. For example - If we have a unique constraint on a combination of columns and then trying to insert duplicate column values. | ||||
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Ans. Unique constraint ensures that a columns or combination or columns are always unique in a table and hence doesn't allow null or duplicates to be entered for the column or combination of columns. | ||||
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![]() org.hibernate.exception.ConstraintViolationException: could not insert: [<Entity>] Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (<Constraint Name>) violated and how would you go about debugging it ? | ||||
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