Maurice Tutor

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    Argosy University/ Phoniex University/
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Category > Computer Science Posted 07 May 2018 My Price 9.00

SQL query

Consider the following relational schema and SQL query:

1. What information about these relations will the query optimizer need to select a good query execution plan for the given query?

2. How many different join orders, assuming that cross-products are disallowed, will a System R style query optimizer consider when deciding how to process the given query? List each of these join orders.

3. What indexes might be of help in processing this query? Explain briefly.

4. How does adding DISTINCT to the SELECT clause affect the plans produced?

5. How does adding ORDER BY  to the query affect the plans produced?

6. How does adding GROUP BY  to the query affect the plans produced?

 

Answers

Maurice Tutor
(5)
Status NEW Posted 07 May 2018 08:05 PM My Price 9.00

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