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

Author Question: When does a partial functional dependency occur? What will be an ideal ... (Read 92 times)

xclash

  • Hero Member
  • *****
  • Posts: 681
on: Jul 7, 2018
When does a partial functional dependency occur?
 
  What will be an ideal response?

Question 2

What is a data dictionary?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ririgirl15

  • Sr. Member
  • ****
  • Posts: 385
Reply #1 on: Jul 7, 2018
Answer to Question 1

A partial functional dependency occurs when a column of a relation is functionally dependent
on a component of a composite primary key.

Answer to Question 2

A data dictionary is a repository of the metadata (data about the data) of the database. The data dictionary, also sometimes called the metadata repository, contains information such as the names of the tables, names and types of columns in them, the primary keys, referential integrity constraints, and so on. The metadata showing the structure of the functioning database system is automatically stored by the DBMS in the data dictionary.


xclash

  • Member
  • Posts: 681
Reply 2 on: Jul 7, 2018
YES! Correct, THANKS for helping me on my review

Perkypinki

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

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.

Some common functional groups of biomolecules Some common functional groups of biomolecules
Functional groups Functional groups
Normal Partial Pressures Normal Partial Pressures
Does pregnancy occur during breastfeeding? "هل يحدث حمل أثناء الرضاعة Does pregnancy occur during breastfeeding? "هل يحدث حمل أثناء الرضاعة
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ... Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...
A partial map of mutations in the A and B cistrons of the rII locus of phage T4 A partial map of mutations in the A and B cistrons of the rII locus of phage T4
Video: Central Nervous System Animation

For a complete list of videos, visit our video library