Examples of using Weak entity in English and their translations into Serbian
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Colloquial
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Ecclesiastic
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Computer
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Latin
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Cyrillic
A weak entity is represented by a double rectangle.
The second thing, we know is a weak entity does not have a primary key.
A weak entity is represented by a double rectangle.
The collection of similar weak entities is called Weak Entity Set.
A weak Entity is represented using double rectangular boxes.
Talking about the Strong and Weak entity, we must know what does an entity means.
The weak entity always depends on the strong entity for its existence.
Here, we will discuss two types of entities Strong entity and Weak entity.
The weak entity always depends on the strong entity for its existence.
A strong entity is denoted with a single rectangle and a weak entity is denoted with a double rectangle.
Weak entity always has total participation in the identifying relationship shown by double line.
Now how to identify who had borrowed them this can be done with the help of primary key of the weak entity(Loan_name+ Cust_ID).
We have Loan as our weak entity, and as I said above for each loan there must be at least one borrower.
Each entity in a strong entity set can be identified uniquely as it has a primary key but, we may ormay not identify each entity in a weak entity as it does not have a primary key and it may contain redundant entities. .
Weak entity do not have the primary key instead it has a partial key that uniquely discriminates the weak entities. .
A strong entity holds the relationship with the weak entity via an Identifying Relationship, which is denoted by double diamond in the ER diagram.
A weak entity always depends on the strong entity for its existence whereas, a strong entity is independent of any other entity's existence.
So here Loan_name, the partial key of the weak entity and Cust_ID primary key of customer entity makes primary key of loan entity. .
The strong entity may ormay not show the total participation in its relations, but the weak entity always shows total participation in the identifying relationship which is denoted by the double line.
The basic difference between strong entity anda weak entity is that the strong entity has a primary key whereas, a weak entity has the partial key which acts as a discriminator between the entities of a weak entity set.
Weak entities are represented by a double lined rectangle.