Maurice Tutor

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Teaching Since: May 2017
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Accounting Posted 11 Aug 2017 My Price 4.00

SQL queries

Consider SQL queries Q1, Q8, Q1B, Q4, and Q27 from Chapter 8.

a. Draw at least two query trees that can represent each of these queries. Under what circumstances would you use each of your query trees?

b. Draw the initial query tree for each of these queries, then show how the query tree is optimized by the algorithm outlined in Section 18.3.2.

c. For each query, compare your own query trees of part (a) and the initial and final query trees of part (b).

Answers

Maurice Tutor
(5)
Status NEW Posted 11 Aug 2017 12:08 AM My Price 4.00

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