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Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by considering some of its attributes in conjunction with the primary key attributes of another entity, which is known as the identifying owner entity.
Usually a partial key is attached to a weak entity type that is used for unique identification of weak entities associated to a particular owner entity type. The following restrictions must hold:
Define the following constraints for the table client. (i) BAL_DUE must be at least 1000. (ii) NAME is a unique key. (i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1
explain cascading rollback
Soccer player ER Diagram to Relational database schema
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
usecase diagram,activity diagraM,SEQUENCE DIAGRAM
Function requirement as given: 1> manage fans and likes and followings those information from facebook. twitter. google+ and linkedin etc 2> Organize the clients from email m
What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
Define Fifth Normal form is concerned with Ans : Fifth Normal form is concerned with Join dependency.
#questiontypes of keys examples..
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