domain website price


What is Entity? And also define Weak Entity Set?

Database

Entities are the principle data object about which information is to be collected. Entities are usually recognizable concept, either concrete or abstract, such as person, places, thing or events, which have relevance to the databases. Some specific example of entities are employees, project etc.

Entities are classified as independent of dependent:: As independent entity(strong) is one that does not rely on another for identification. A dependent entity (weak) is one that relies on another for identification.

WEAK ENTITY TYPES OR SET:-
A set of entity is called an entity set. The two types of entity set are:--

  1. Weak entity set: - Collection of dependent or weak entities if called weak entity set. Weak entities are those which dependent upon another. The entity set which does not have sufficient attributes to form a primary key.
  2. Srong entity set: -- Collection of dependent or strong entities is called strong entity set. An entity set that has a primary key is called as strong entity set.

Entity set does not have a primary key is a weak entity set. Each weak set must be a part of one to man relationship set.

Bookmark and Share




Gallery

Related Topics

Comments



Submit Reviews:


(Enter the characters seen on the image below.)



Advertisement

Direct AWS
7718 Green Garland Drive
Springfield
Williamsburg

Packers and movers in Ambala
No. 2241/17, 1st Floor, Shopping Building, Mariwala Town,
Chandigarh

Packers and movers in Mohali
No. 2241/17, 1st Floor, Shopping Building, Mariwala Town, 30B, Manimajra
Chandigarh

Leo Safe Packers and Movers in Chandigarh
lot-34,1st Floor, New Timber Market,Transport Nagar
Secto 26,Chandigarh
Chandigarh

Packers and Movers in Chandigarh - Care Home Relocation
Shop No. 2241/15, 1st Floor, Mari Wala Town, Manimajra
Chandigarh

Woodville High School
11 Actil Avenue
St Clair SA 5011
Adelaide

Cedar College
215-233 Fosters Rd Northgate
South Australia 5085
Adelaide

Adelaide High School
West Terrace Adelaide
South Australia 5000
Adelaide

ALARSIN (PHARMACEUTICALS)
A/32 Street No. 3
M.I.D.C. Andheri (East)
Mumbai

ALICE PHARMA PVT. LTD.
A-302 Everest Nivara Infotech Park
MIDC Main Road Indira Nagar Turbhe
Navi Mumbai