Which of the following is not a logical database structure?

A. Chain

B. Network

C. Tree

D. Relational

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  1. The language that requires a user to specify the data to be retrieved without specifying exactly how…
  2. In E-R Diagram total participation is represented by
  3. The metadata is created by the
  4. Which one is correct statement?Logical data independence provides following without changing application…
  5. DFD stands for
  6. Protection of data from unauthorized Disclosure results in loss of _______
  7. ______is a special type of integrity constraint that relates two relations & maintains consistency across…
  8. The drawback of shadow paging technique are
  9. Change Staff table by removing default of Assistant for position column
  10. The ____ operator joins two or more conditions and displays rows only if that rows data satisfies all…
  11. Isolation of the transactions is ensured by
  12. The one guideline to be followed while designing the database is
  13. In an ER diagram the ___shape specifies the Attibute and a ____ shape specifies the primary key attribute.
  14. Which of the following is not comparison operator?
  15. Maximum height of a B+ tree of order m with n key values is
  16. Drop Table cannot be used to drop a table referenced by a ______ constraint.
  17. DBMS is a collection of _____ that enables user to create and maintain a database.
  18. DROP is a statement in SQL.
  19. Union operator is a :
  20. ______contains information that defines valid values that are stored in a column or data type.
  21. In SQL, testing whether a subquery is empty is done using
  22. _____clause is an additional filter that is applied to the result.
  23. The set of all values that can be taken by the attribute is called as _______ of the attribute.
  24. The relational model is based on the concept that data is organized and stored in two-dimensional tables…
  25. The ______ key of a relation is the attribute (column) or collection of attributes, which uniquely identify…
  26. Which two files are used during operation of the DBMS?
  27. Which of the following aggregate functions does not ignore nulls in its results?.
  28. For using a specific database …………… command is used.
  29. If a transaction T has obtained an exclusive lock on item Q, then T can
  30. Given the following relation S(SNO,SNAME,CITY) write a query to update the value of CITY to KANPUR for…