Relational Algebra does not have

A. Selection operator.

B. Projection operator.

C. Aggregation operators.

D. Division operator.

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  1. Tree structures are used to store data in
  2. The statement that is executed automatically by the system as a side effect of the modification of the…
  3. In SQL, testing whether a subquery is empty is done using
  4. Which of the following relational algebra operations do not require the participating tables to be union-compatible?
  5. In a relational schema, each tuple is divided into fields called
  6. ______contains information that defines valid values that are stored in a column or data type.
  7. Consider the join of relation R with a relation S. If R has m tuples and S has n tuples, then the maximum…
  8. For using a specific database …………… command is used.
  9. The clause alter table in SQL can be used to
  10. Which of the following is not a characteristic of a relational database model?
  11. Given the following relation S(SNO,SNAME,CITY) write a query to update the value of CITY to KANPUR for…
  12. Which of the following is not comparison operator?
  13. operator is used to compare a value to a list of literals values that have been specified.
  14. The middleware databases in which the business rules act are applicable to _______ tier architectures
  15. As per equivalence rules for query transformation, selection operation distributes over
  16. Dependency preservation is not guaranteed in
  17. Which of the following concurrency control schemes is not based on the serializability property?
  18. Key to represent relationship between tables is called
  19. The data in the database at a particular moment of time is called the _______
  20. A logical schema
  21. Which of the following ensures the atomicity of the transaction?
  22. ………………… approach reduces time and effort required for design…
  23. The concept of mapping of ______ entity types is the concept in which the for each strong entity type…
  24. Between DRAM and magnetic disk storage another form of memory, called ______ memory is becoming common…
  25. Use of UNIQUE while defining an attribute of a table in SQL means that the attribute values are
  26. Which of the following is not a consequence of non-normalized database?
  27. _____clause is an additional filter that is applied to the result.
  28. Employees in a company are each assigned their own office, i.e. for each employee there exists a unique…
  29. Wait-for graph is used for
  30. The set of all values that can be taken by the attribute is called as _______ of the attribute.