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Relational Algebra does not have

A. Selection operator.

B. Projection operator.

C. Aggregation operators.

D. Division operator.

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  1. Relationships among relationships can be represented in an-E-R model using
  2. The normalization was first proposed by .
  3. If the closure of an attribute set is the entire relation then the attribute set is a
  4. Grant and revoke are _____ statements.
  5. Which of the following constitutes a basic set of operations for manipulating relational data?
  6. The size of a data item is called its _______, which can be a field of some record or may be a larger…
  7. Which of the following is true for network structure?
  8. A data type or format is specified for each _________
  9. The data in the database at a particular moment of time is called the _______
  10. In multiple granularity of locks SIX lock is compatible with
  11. Isolation of the transactions is ensured by
  12. The clause in SQL that specifies that the query result should be sorted in ascending or descending order…
  13. The full form of GUI is _________
  14. Create a table with the following attributes: Employee(EMPNO integer, EMPNAME of 10 characters)
  15. Checkpoints are a part of
  16. Data items grouped together for storage purposes are called a
  17. As per equivalence rules for query transformation, selection operation distributes over
  18. In E-R Diagram total participation is represented by
  19. The collection of information stored in a database at a particular moment is called as ......
  20. A top-to-bottom relationship among the items in a database is established by a
  21. A table can have only one
  22. The relational model is based on the concept that data is organized and stored in two-dimensional tables…
  23. An advantage of views is
  24. The _____ category includes storage media that can be operated on directly by the computers central…
  25. The _______ is a set of programs to use and / or modify this data.
  26. What is a disjoint less constraint?
  27. The normal form that is not necessarily dependency preserving is
  28. _____ database is used to provide statistical information or summaries of values based on various criteria.
  29. Which of the following ensures the atomicity of the transaction?
  30. ____ table store information about database or about the system.