Entity (1 Viewer)

[dchait]

Whats the definition of an entity - a table or record? As i know an attribute is a field....

 

[grendel]

entity=table.

for example in and ERD (entity/relationship diagram), you show all of the tables in an RDBMS and how the tables are connected.

note: ERD = Schema

 

[dchait]

Thanks!

Thanks....

How many past papers has everyone done???

Some of the questions are so ambiguous!!!

Do you guys thing the CSSA/ Independant / Heinnemann trials are similar to the actual HSC?

 

[neuro_logik]

I do past hsc papers, and some CSSA ones.

 

[grendel]

standards packages are most useful but there is not a standards package for last years hsc.

i think the success one study guide may have solutions to last years hsc.

independent papers are pretty good.

 

[Freedom_Dragon]

get urself a copy of "The HSC Assistance IPT" program

its got around a 1000 multiple choice question.

 

[Seraph]

huh...

entity is a defined property of an attribute


Students student_id


Teachers teacher_id

 

[grendel]

huh...

entity is a defined property of an attribute


Students student_id


Teachers teacher_id

Entities are the principal data object about which information is to be collected. Entities are usually recognizable concepts, either concrete or abstract, such as person, places, things, or events which have relevance to the database. Some specific examples of entities are EMPLOYEES, PROJECTS, INVOICES.

An entity is analogous to a table in the relational model.

link - http://www.utexas.edu/its/windows/database/datamodeling/dm/erintro.html

 

[Seraph]

my goodness

i cant believe i said that


ATTRIBUTE IS THE DEFINED PROPERTY OF AN ENTITY

yes an entity is a specific thing about which information is collected and stored e.g Students , Teachers

 

[jumb]

Some of the questions are so ambiguous!!!

I completely agree. IPT is gay like that though.

 

[+GriM ReApeR+]

get urself a copy of "The HSC Assistance IPT" program

its got around a 1000 multiple choice question.

I got that ages ago from school but it never worked on my computer ;P

 

[grover]

An entity is something about which data is stored. Eg in a database of students (grades, DOB, classes, teachers absentees etc) a student is the entity as the DB stores data about them...
In an ERD/Schema or whatever you want to call it, the entity is whats on the top.