What is a disjoint less constraint?

A. It requires that an entity belongs to no more than one level entity set.

B. The same entity may belong to more than one level.

C. The database must contain an unmatched foreign key value.

D. An entity can be joined with another entity in the same level entity set.

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Relational Algebra is
  2. The part of a database management system which ensures that the data remains in a consistent state is
  3. ______is a preferred method for enforcing data integrity
  4. The normalization was first proposed by .
  5. The concept of mapping of ______ entity types is the concept in which the for each strong entity type…
  6. Data items grouped together for storage purposes are called a
  7. The drawback of shadow paging technique are
  8. The ______ indexes are forced to store only record IDs in the data structure and require at least one…
  9. ………………… approach reduces time and effort required for design…
  10. Between DRAM and magnetic disk storage another form of memory, called ______ memory is becoming common…
  11. Which of the following is not comparison operator?
  12. For using a specific database …………… command is used.
  13. Shadow paging has
  14. Which of the following is not a characteristic of a relational database model?
  15. If an entity can belong to only one lower level entity then the constraint is
  16. A relation is in attribute of other composite key. if an attribute of a composite key is dependent on…
  17. _____ command can be used to modify a column in a table
  18. It is an abstraction through which relationships are treated as higher level entities
  19. The one guideline to be followed while designing the database is
  20. Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.
  21. A ______ module is typically designed so that it will run on a user workstation or personal computer.
  22. A table can have only one
  23. What is data integrity?
  24. Which normal form is considered adequate for normal relational database design?
  25. According to the levels of abstraction, the schema at the intermediate level is called
  26. Tree structures are used to store data in
  27. The data in the database at a particular moment of time is called the _______
  28. Which is the best file organization when data is frequently added or deleted from a file?
  29. DBMS is a collection of _____ that enables user to create and maintain a database.
  30. Union operator is a :