This topic contains a solution. Click here to go to the answer

Author Question: You have been given two tables, CUSTOMER and SALE. You want to check the referential integrity ... (Read 83 times)

eruditmonkey@yahoo.com

  • Hero Member
  • *****
  • Posts: 546
You have been given two tables, CUSTOMER and SALE. You want to check the referential integrity constraint: SALE.CustomerNumber must exist in CUSTOMER.
 
  CustomerNumberYou run the following SQL query:SELECT CustomerNumberFROM SALEWHERE CustomerNumber NOT IN (SELECT CustomerNumber FROM CUSTOMER);What is shown in the results of this query?A) All values of CustomerNumber that match the constraint.
  B) All values of CustomerNumber that violate the constraint.
  C) All values of CustomerNumber where
  SALE.CustomerNumber = CUSTOMER.CustomerNu mber.
  D) All values of Customer number that are in CUSTOMER but not in SALE.

Question 2

In two-phase locking, all locks are obtained during the growing phase.
 
  Indicate whether the statement is true or false



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

connor417

  • Sr. Member
  • ****
  • Posts: 329
Answer to Question 1

B

Answer to Question 2

TRUE




eruditmonkey@yahoo.com

  • Member
  • Posts: 546
Reply 2 on: Jul 7, 2018
Excellent


sultansheikh

  • Member
  • Posts: 335
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

For a complete list of videos, visit our video library