Decorrelation: a. Write a nested query on the relation account to find for each branch with name

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Decorrelation:

a. Write a nested query on the relation account to find for each branch with name starting with “B”, all accounts with the maximum balance at the branch.

b. Rewrite the preceding query, without using a nested subquery; in other words, decorrelate the query.

c. Give a procedure (similar that that described in Section 14.4.5) for decorrelating such queries.

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Database System Concepts

ISBN: 978-0072554816

4th Edition

Authors: Henry F. Korth, S. Sudarshan

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Question Posted: Jan 29, 2011 01:42 AM

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Decorrelation: a. Write a nested query on the relation account to find for each branch with name

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a The nested query is as follows select Sacount number from account S where Sbranch name like B and ...View the full answer

Database System Concepts

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