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|Java - Interview Questions and Answers|
|Ans. NOT NULL|
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|Like Discuss Correct / Improve  sql   oracle   database   ddl   constraint   table creation|
|What's the benefit for specifying constraints like Not Null , Primary Key explicitly instead of specifying it against the column ?|
|How can we disable a constraint ?|
|How to know the constraints on a Table in Oracle ?|
|When do we generally get this database error - integrity constraint violated - parent key not found ?|
|When do we generally get the database error - Unique Constraint Violated ?|
|Write an SQL Statement to add a foreign key constraint in oracle ?|
| What do you make out of this error|
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 ?
|What is ConstraintViolationException in Hibernate ?|
|What are the different database constraint types ?|