This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The UNION of two relations A and B consists of all rows that are either in relation A or in relation ... (Read 64 times)

tingc95

  • Hero Member
  • *****
  • Posts: 556
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


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mirabriestensky

  • Sr. Member
  • ****
  • Posts: 325
Reply #1 on: Jul 7, 2018
Answer to Question 1

TRUE

Answer to Question 2

D


tingc95

  • Member
  • Posts: 556
Reply 2 on: Jul 7, 2018
Excellent

ultraflyy23

  • Member
  • Posts: 312
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

Did you know?

In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

This slave burial service, painted by John Antrobus in 1860, reflects an inversion of power relation This slave burial service, painted by John Antrobus in 1860, reflects an inversion of power relation
The hypothalamus and pituitary glands and their relation to the brain. The hypothalamus and pituitary glands and their relation to the brain.
Four ways of thinking about the relations among the perception of emotion-inducing stimuli, the ... Four ways of thinking about the relations among the perception of emotion-inducing stimuli, the ...
Relations Between Iconic Memory, Short-Term Memory, and Long-Term Memory Relations Between Iconic Memory, Short-Term Memory, and Long-Term Memory
Relations with China and Russia Relations with China and Russia
A polysome consists of an mRNA molecule loaded with many ribosomes, all engaged in translation. A polysome consists of an mRNA molecule loaded with many ribosomes, all engaged in translation.
Video: Amniocentesis and CVS Animation

For a complete list of videos, visit our video library