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Author Question: When redesigning a database, how can we check assumptions about functional dependencies? What ... (Read 54 times)

kshipps

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on: Jul 7, 2018
When redesigning a database, how can we check assumptions about functional dependencies?
 
  What will be an ideal response?

Question 2

SQL query results are displayed:
 
  A) in a tabbed results window.
  B) in a tabbed Results1 window.
  C) in a tabbed Document window.
  D) in a tabbed Messages window.
  E) in a tabbed Finished window.


billybob123

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Reply #1 on: Jul 7, 2018
Answer to Question 1

There are two related SQL techniques that we can use to check assumptions about functional dependencies in an existing database. The first is to use a correlated subquery with the SQL IN keyword, and the second is to use a correlated subquery structure using the SQL EXISTS and/or NOT EXISTS keywords.

Answer to Question 2

A


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