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Interview Questions and Answers for 'Database constraint' - 3 question(s) found - Order By Newest

 Q1. What are the different database constraint types ?Database
Ans. Not Null
Unique
Primary Key
Foreign Key
Check Constraint

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Related Questions
  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 ?
  Which constraint cannot be specified as an explicit constraint and should be specified with the column only ?
  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 ?

 Q2. What is a check database constraint ?Database
Ans. Constraint specifies the values allowed in one or more columns of every row of a table.

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   Like         Discuss         Correct / Improve     database constraint

Related Questions
  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 ?
  Which constraint cannot be specified as an explicit constraint and should be specified with the column only ?
  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 ?

 Q3. What is the relation between Primary Key, Unique and Not Null constraint ?Database
Ans. Primary Key constraint means that the column(s) should be unique and doesn't allow null. So Primary key constraint implies unique and not null constraint too.

Unique constraint implies not null constraint too as allowing null would violate uniqueness on those columns.

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   Like         Discuss         Correct / Improve     database constraint

Related Questions
  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 ?
  Which constraint cannot be specified as an explicit constraint and should be specified with the column only ?
  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 ?

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