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The Eladr Protocol is a decentralized, security and efficiency enhanced Web3 noSQL database powered by IPFS as the data storage layer https://ipfs.io/, and the Cardano block chain as the rewards token platform, https://cardano.org/. It provides a JSON based, IPFS layer 2 solution for data indexing and retrieval in an 'append only' file system built with open source Node.js API libraries.

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Database-Management-System-->View question

What is set intersection operation in relational algebra? - Database management system

Presidency University, Bangalore- Database management system 


Asked On2017-07-06 05:54:17 by:Aparna-Dasgupta

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Relations are sets, so we can apply set-theoretic operators However, we want the results to be relations (that is, homogeneous sets of tuples) It is therefore meaningful to only apply union, intersection, difference to pairs of relations defined over the same attributesWe have made no assumptions about the sets of attributes X1 and X2 on which the operands of a join operation are defined; the two sets could even be equal or disjoint.
If X1 = X2 then r1 ⋈ r2 = r1 ∩ r2 since, by definition, the result is a relation which includes tuples t such that t[X1] ∈ r1 and t[X2] ∈ r2, and X1 = X2

Answerd on:2017-07-09 Answerd By:prajwalamv

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