Mathematics, 21.02.2020 01:51, krystalsanabria83
Let R(A, B) be a relation with r > 0 tuples, and let S(B, C) be a relation with s > 0 tuples. We assume that A, B, and C have the same data type. For each of the following Relational Algebra expressions, in terms of r and s, determine the minimum and maximum number of tuples that the result relation can have. In other words, we are interested in the number of tuples the following Relational Algebra expressions can have at least and at most. The numbers have to be given by using the two variables r and s. Please note that you have to give precise and formal explanations for your answers.
a. [4 points] R u rho rum(S)
b. [3 points] (R Da R) pA R
c. [4 points] π4.dRx S)
d. [5 points] ơedR bd S)
Answers: 3
Mathematics, 21.06.2019 13:50, EthanIsHyper
Jayda's house is located at (1, 5). she can walk in a straight line to get to cristian's house. a fast-food restaurant is located at (11, 0) and partitions the way from jayda's house to cristian's house by a ratio of 5: 1. find the coordinate of cristian's house. me . im a little stuck
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With #! i’ve tried to figure it out but i can’t.
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Mathematics, 21.06.2019 16:00, lil8174
Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.
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Let R(A, B) be a relation with r > 0 tuples, and let S(B, C) be a relation with s > 0 tuples....
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