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What action does ⋈ operator perform in relational algebra
  • a)
    Output specified attributes from all rows of the input relation and remove duplicate tuples from the output
  • b)
    Outputs pairs of rows from the two input relations that have the same value on all attributes that have the same name
  • c)
    Output all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes)
  • d)
    Return rows of the input relation that satisfy the predicate
Correct answer is option 'A'. Can you explain this answer?
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What action does operator perform in relational algebraa)Output speci...
⋈ Outputs specified attributes from all rows of the input relation. Remove duplicate tuples from the output. The operation is called the join operation.
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What action does operator perform in relational algebraa)Output speci...
Explanation:

The action performed by the projection operator in relational algebra is to output specified attributes from all rows of the input relation and remove duplicate tuples from the output.

Projection is one of the fundamental operations in relational algebra and is denoted by the Greek letter π (pi). It allows us to select a subset of attributes from a relation and discard the rest. The result of the projection is a new relation that contains only the selected attributes.

Here is a detailed explanation of the projection operation:

1. Selecting attributes: The projection operator takes a relation as input and specifies a list of attributes that we want to select from that relation. These attributes can be specified using attribute names or by their position in the relation.

2. Outputting rows: The projection operator outputs all the rows from the input relation, but only includes the selected attributes in the output. The order of the attributes in the output relation may be different from the order in the input relation.

3. Removing duplicates: After selecting the specified attributes, the projection operator removes duplicate tuples from the output relation. This means that if there are multiple rows in the input relation that have the same values for the selected attributes, only one of them will appear in the output.

4. Result relation: The result of the projection operation is a new relation that contains only the selected attributes and does not have any duplicate tuples. This result relation can be used as input for further operations in relational algebra.

In summary, the projection operator in relational algebra selects specified attributes from all rows of the input relation and removes duplicate tuples from the output. It is a fundamental operation that allows us to manipulate and analyze data in a relational database.
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What action does operator perform in relational algebraa)Output specified attributes from all rows of the input relation and remove duplicate tuples from the outputb)Outputs pairs of rows from the two input relations that have the same value on all attributes that have the same namec)Output all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes)d)Return rows of the input relation that satisfy the predicateCorrect answer is option 'A'. Can you explain this answer?
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