Computers and Technology, 13.07.2019 01:20 jjsavage06
Consider a database containing two relations: r(a, b, c) and s(d, e, f). for each of the 12 rewriting rules for relational algebra expression, give an example pair of relational algebra expressions involving r and s for the rule, and give an example pair to show the rewriting rule cannot be used if someof the conditions for the rule is not satisfied. you may want to provide these examples as two tables
Answers: 1
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Computers and Technology, 22.06.2019 13:30
Use the keyword strategy to remember the meaning of the following word. the meaning for the word has been provided. write your keyword and describe the picture you would create in your mind. centurion: a commander in the army of ancient rome. keyword: picture:
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What part of the interface displays the external references contained in a selected cell? the status bar the review tab the scroll bar the formula bar
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If you're using an existing powerpoint presentation that will receive new slides based on a word outline, select the a. slide that will appear after the new slides. b. first slide in the presentation. c. slide that will appear before the new slides. d. last slide in the presentation.
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Consider a database containing two relations: r(a, b, c) and s(d, e, f). for each of the 12 rewriti...
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