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

Author Question: Distinguish between entity identifiers and keys. What will be an ideal ... (Read 52 times)

nummyann

  • Hero Member
  • *****
  • Posts: 576
on: Jul 7, 2018
Distinguish between entity identifiers and keys.
 
  What will be an ideal response?

Question 2

In MySQL, surrogate keys that use a sequence maintained by MySQL should be given a data type of IDENTITY.
 
  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

mariahkathleeen

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jul 7, 2018
Answer to Question 1

An entity identifier is an attribute or group of attributes that is used to name or identify instances of an entity class. Unlike a key in the relational model, an entity identifier is more of a logical concept. It is simply an attribute that the users think of as distinguishing between entity instances in their environment.

Answer to Question 2

FALSE


nummyann

  • Member
  • Posts: 576
Reply 2 on: Jul 7, 2018
Gracias!

samiel-sayed

  • Member
  • Posts: 337
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

There are more bacteria in your mouth than there are people in the world.

Some mangrove islands in the Florida Keys, which number in the thousands, are convenient places to t Some mangrove islands in the Florida Keys, which number in the thousands, are convenient places to t
An example of color blindness test. A person with red-green color blindness would not be able to dis An example of color blindness test. A person with red-green color blindness would not be able to dis
Number of lower molar cusps is one of the features used to distinguish sundadonts from sinodonts. Number of lower molar cusps is one of the features used to distinguish sundadonts from sinodonts.
Cultures Ideal Body Types Cultures Ideal Body Types
The Number of Children Americans Think Are Ideal The Number of Children Americans Think Are Ideal
If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas? If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas?
Video: Arthroscopy

For a complete list of videos, visit our video library