Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Explain the following constraints : i. Entity integrity constraint. ii. Referential integrity constraint. iii. Domain constraint.

Photo of author

By By Team EasyExamNotes

Entity Integrity Constraint:

  • Rule: No primary key attribute can have a null value.
  • Example: In the table where SID is the primary key, every SID must have a value. So, having a null value for SID is not allowed.
SIDNameClass (semester)Age
8001Ankit1st19
8002Srishti1st18
8003Somvir4th22
8004Sourabh6thA

Referential Integrity Constraint:

  • Rule: If a foreign key in one table refers to the primary key in another table, every foreign key value must either be null or exist in the referenced table.
  • Example: In the second table, the DNO (Department Number) is a foreign key that refers to the DNO in the third table. Every DNO in the second table must be either null or match a DNO in the third table.
ENONAMEAgeDNO
1Ankit1910
2Srishti1811
4Sourabh2214
DNOD.Location
10Rohtak
11Bhiwani
12Hansi

Domain Constraints:

  • Rule: Specifies the allowed set of values for an attribute based on its data type.
  • Example: If the Age attribute is defined as an integer, then every value in the Age column must be a valid integer.
SIDNameClass (semester)Age
8001Ankit1st19
8002Srishti1st18
8003Somvir4th22
8004Sourabh6thA

These constraints help maintain the accuracy, consistency, and reliability of data in a database.

Download as PDF

Related posts:

  1. What is database management system (DBMS) ? What are the tasks performed by users in DBMS ?
  2. What are the advantages and disadvantages of DBMS ?
  3. What do you understand by database users ? Describe the different types of database users.
  4. Who are data administrators ? What are the functions of database administrator ?OR Discuss the role of database adinistrator.
  5. What is data abstraction ? Explain different levels ofabstraction.
  6. Explain the differences between physical level,conceptual level and view level of data abstraction.
  7. Explain the difference between database management system (DBMS) and file system.
  8. Discuss the architecture of DBMS. What are the types of DBMS architecture ?
  9. What are data models ? Briefly explain different types of data models.
  10. Describe data schema and instances.
  11. Describe data independence with its types
  12. Describe the classification of database language. Which type of language is SQL ?
  13. Explain DBMS interfaces. What are the various DBMS interfaces ?
  14. What is ER model ? What are the elements of ER model ? What are the notations of ER diagram ?
  15. What do you understand by attributes and domain ?Explain various types of attributes used in conceptual data model.
  16. Construct an ER diagram for University system.
  17. Construct an ER diagram for the registrar’s office
  18. Explain the primary key, super key, foreign key and candidate key with example. OR Define key. Explain various types of keys.
  19. What do you mean by a key to the relation ? Explain the differences between super key, candidate key and primary key.
  20. Explain generalization, specialization and aggregation. OR Compare generalization, specialization and aggregation with suitable examples.
  21. What is Unified Modeling Language ? Explain different types of UML.
  22. What is relational model ? Explain with example.
  23. Explain constraints and its types.
  24. Consider the following relations:
  25. What are the additional operations in relational algebra ?
  26. Explain integrity constraints.
  27. Describe mapping constraints with its types.
  28. Explain how a database is modified in SQL. OR Explain database modification.
  29. Discuss join and types with suitable example. Define join. Explain different types of join.
  30. Describe the SQL set operations

2 thoughts on “Explain the following constraints : i. Entity integrity constraint. ii. Referential integrity constraint. iii. Domain constraint.”

  1. Your article broadened my perspective on how to make the most of traveling and taught me things I didn’t know before. I appreciate the time and effort you put into sharing this knowledge with us. We talked about a similar topic about solo travel experiences on TravelForums. I’m eager to see what else you’ll share!

  2. I always spent my half an hour to read this web site’s articles everyday
    along with a mug of coffee.!

Leave a Comment