A top-to-bottom relationship among the items in a database is established by a

A. Hierarchical schema

B. Network schema

C. Relational Schema

D. All of the above

Related Questions

  1. HSAM stands for ……….
  2. A table can have only one
  3. SQL server stores index information in the _____system table
  4. The concept of mapping of ______ entity types is the concept in which the for each strong entity type…
  5. The data in the database at a particular moment of time is called the _______
  6. The fact that all employees of a particular organization should not have salaries more than $10000 is…
  7. DFD stands for
  8. As per equivalence rules for query transformation, selection operation distributes over
  9. The transactions like adding an employee, enrolling a student in a course are examples of _______
  10. The default level of consistency in SQL is
  11. In SQL the word natural can be used with
  12. ______contains information that defines valid values that are stored in a column or data type.
  13. The fact that information in the data warehouse changes far less often and may be regarded as non-real-time…
  14. In 2NF
  15. A logical schema
  16. When an E-R diagram is mapped to tables, the representation is redundant for
  17. The data models defined by ANSI/SPARC architecture are
  18. The cost of reading and writing temporary files while evaluating a query can be reduced by
  19. The rule that a value of a foreign key must appear as a value of some specific table is called a
  20. DBMS helps achieve
  21. The _______ is a set of programs to use and / or modify this data.
  22. If a transaction T has obtained an exclusive lock on item Q, then T can
  23. Which of the following relational algebra operations do not require the participating tables to be union-compatible?
  24. Dependency preservation is not guaranteed in
  25. Manager salary details are hidden from the employee .This is
  26. Use of UNIQUE while defining an attribute of a table in SQL means that the attribute values are
  27. Change Staff table by removing default of Assistant for position column
  28. What is data integrity?
  29. The normalization was first proposed by .
  30. The ______ indexes are forced to store only record IDs in the data structure and require at least one…

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