<div>
hi,<br />
<br />
The existance of a weak entity depends on the existence of a strong entity; it must relate to the strong via a on-to-many relationship set.<br />
<br />
The primary key of a weak entity is formed by the primary key of the strong entity on which the weak entity set is existence depend, plus the weak entity set’s discriminator (partial Key).<br />
<br />
<br />
<br />
A strong entity is one that has its own primary key and dont depand on any other entitie.<br />
<br />
If you need more info, ask ..<br />
<br />
see ya<br />

</div>


hi,

The existance of a weak entity depends on the existence of a strong entity; it must relate to the strong via a on-to-many relationship set.

The primary key of a weak entity is formed by the primary key of the strong entity on which the weak entity set is existence depend, plus the weak entity set’s discriminator (partial Key).



A strong entity is one that has its own primary key and dont depand on any other entitie.

If you need more info, ask ..

see ya


<div>
Yes I need some more information with example.<br />
<br />
Thanks,<br />

</div>


Yes I need some more information with example.

Thanks,


<div>
Hi MajorJohn<br />
<br />
Typical Expample of weak and strong entity<br />
<br />
EMPLOYEE and DEPENDANTS<br />
<br />
The entity DEPENDANTS depends of the entity EMPLOYEE<br />
DEPENDANTS = Wife, childrens, family.<br />
<br />
In a Company DB the DEPENDANTS entity can exist by it self. In these case we make the relation DEPENDANTS --&lt;depends&gt;-- EMPLOYEE<br />
<br />
Bye Bye<br />

</div>


Hi MajorJohn

Typical Expample of weak and strong entity

EMPLOYEE and DEPENDANTS

The entity DEPENDANTS depends of the entity EMPLOYEE
DEPENDANTS = Wife, childrens, family.

In a Company DB the DEPENDANTS entity can exist by it self. In these case we make the relation DEPENDANTS --<depends>-- EMPLOYEE

Bye Bye


<div>
The above model may not be a true example. It could also be possible for a dependent to be an Employee!! Nepotism is best kept in the family!!<br />

</div>


The above model may not be a true example. It could also be possible for a dependent to be an Employee!! Nepotism is best kept in the family!!


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Description of Weak and Strong Entities.
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Weak and Strong Entities

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.