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Relational Algebra
kumar.dilip
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Oct 28, 2018
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Online Site For practicing Relational Algebra
https://dbis-uibk.github.io/relax/calc.htm
relational-algebra
databases
relations
relational-calculus
joins
kumar.dilip
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Warrior_19
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Nov 16, 2018
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thanks man :)
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Consider the relations r1(P, Q, R) and r2(R, S, T) with primary keys P and R respectively. The relation r1 contains 2000 tuples and r2 contains 2500 tuples. The maximum size of the join r1⋈ r2 is equal to r2⋈ r1 true or false?
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Raghuramkrishnan Exercise-4.3 page-127
Given relation catalog(sid, pid, cost) Find pairs of sids such that the supplier with the first sid charges more for some part than the supplier with the second sid what is the relational algebra expression for this?
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May 7, 2019
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♥_Less
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Relational algebra
I have two doubts: 1) A natural join B What will be the result when B don't have any tuple in it. Like in B their is relational algebra expression which is selecting Cars of green color but their is no green color car in table. What will be the ... B In above divison if B is a relational algebra expression returning nothing ( like the B in case 1). What will be the result ?
♥_Less
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