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Tree structures are used to store data in

A. Network model.

B. Relational model.

C. Hierarchical model.

D. File based system.

You can do it
  1. Union operator is a :
  2. Relational Algebra does not have
  3. In multiple granularity of locks SIX lock is compatible with
  4. Which of the following concurrency control schemes is not based on the serializability property?
  5. A logical schema
  6. DFD stands for
  7. ____specifies a search condition for a group or an aggregate.
  8. An outstanding functionality of SQL is its support for automatic_____ to the target data.
  9. A transaction is in state after the final statement has been executed.
  10. Which of the following is a reason to model data?
  11. In SQL, testing whether a subquery is empty is done using
  12. Employees in a company are each assigned their own office, i.e. for each employee there exists a unique…
  13. A data type or format is specified for each _________
  14. If two relations R and S are joined, then the non matching tuples of both R and S are ignored in
  15. The cost of reading and writing temporary files while evaluating a query can be reduced by
  16. DROP is a statement in SQL.
  17. Data items grouped together for storage purposes are called a
  18. Checkpoints are a part of
  19. The ______ language consists of SQL statements for operating on the data (insert, Modify, Delete) in…
  20. The concept of mapping of ______ entity types is the concept in which the for each strong entity type…
  21. _______ product was acquired by Informix, integrated into its RDBMS and introduced as the Informix Universal…
  22. The rule that a value of a foreign key must appear as a value of some specific table is called a
  23. What is a disjoint less constraint?
  24. In an E-R diagram double lines indicate
  25. The ____ operator joins two or more conditions and displays rows only if that rows data satisfies all…
  26. ______is a preferred method for enforcing data integrity
  27. Which two files are used during operation of the DBMS?
  28. According to the levels of abstraction, the schema at the intermediate level is called
  29. Which is the best file organization when data is frequently added or deleted from a file?
  30. Relations produced from an E-R model will always be