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Which of the following forms the complete set of Relational Algebra operations?
  • a)
    Projection, Union, Set difference, and Cross product
  • b)
    Selection, Projection, Union, Set difference, and Cross product
  • c)
    Selection, Projection, Intersection, Set difference, and Cross product
  • d)
    Selection, Union, Set difference, and Cross product
Correct answer is option 'B'. Can you explain this answer?
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Which of the following forms the complete set of Relational Algebra op...
Concept:-
Relational algebra:- Relational algebra is a procedural query language, which takes input as an instance of relations, further uses different operators to perform queries, and yields instances of relations as output. Relational algebra is performed recursively on relation and intermediate results are also considered relation.
The operations of relational algebra are as follows:-
  • Selection
  • Projection
  • Union
  • Set difference
  • Cross product
Additional Information
  • Selection:- It is a unary operator. It is used to select a subset of tuples of the relations that satisfy the selection condition.
  • Projection:- It is also a unary operator. It is used to select the attributes or columns of a relation.
  • Union (U):- It returns a relation containing all tuples that appear in either both or two specified relations.
  • Set difference ( - ):- It is used to return a relation containing all tuples that appear in the first and not in the second of two specified relations.
  • Cross product (X):- The cross product is also known as cartesian product or cross join. It is denoted by ' x '. The relation on which we are performing need not be union compatible. This operation is used to combine tuples from two relations.
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Which of the following forms the complete set of Relational Algebra operations?a)Projection, Union, Set difference, and Cross productb)Selection, Projection, Union, Set difference, and Cross productc)Selection, Projection, Intersection, Set difference, and Cross productd)Selection, Union, Set difference, and Cross productCorrect answer is option 'B'. Can you explain this answer?
Question Description
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