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Author Question: The UNION of two relations A and B consists of all rows that are either in relation A or in relation ... (Read 65 times)

tingc95

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on: Jul 7, 2018
The UNION of two relations A and B consists of all rows that are either in relation A or in relation B or both.
 
  Indicate whether the statement is true or false

Question 2

In database systems, the DBMS enforces rules about which user can perform which action when. The rules are known as ________.
 
  A) referential integrity constraints
  B) data modification control
  C) data reading control
  D) concurrency control


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mirabriestensky

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

TRUE

Answer to Question 2

D


tingc95

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Reply 2 on: Jul 7, 2018
Thanks for the timely response, appreciate it

upturnedfurball

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Reply 3 on: Yesterday
Excellent

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