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Author Question: Normalizing table DOCTOR to 3NF will result in: A) No changes (table DOCTOR remains as is, no ... (Read 159 times)

cdr_15

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on: Jul 7, 2018
Normalizing table DOCTOR to 3NF will result in:
 
  A) No changes (table DOCTOR remains as is, no additional tables)
  B) Two separate tables
  C) Three separate tables
  D) Four separate tables

Question 2

What is a correlated query and how is it used in conjunction with the EXISTS operator?
 
  What will be an ideal response?


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ryrychapman11

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

A

Answer to Question 2

In queries where the inner query (nested query) uses columns from the relations listed in the SELECT part of the outer query, the inner query is referred to as a correlated subquery. In such cases, the EXISTS operator can be used to check if the result of the inner correlated query is empty.


cdr_15

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Reply 2 on: Jul 7, 2018
Wow, this really help

xiazhe

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Reply 3 on: Yesterday
Gracias!

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