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A super key is an attribute or set of attributes used to recognize the records uniquely in a relation.
For instance, in the Relation PERSON defines earlier PERSON_ID is a super key since PERSON_ID is unique for every person. Likewise (PERSON_ID, AGE) and (PERSON_ID, NAME) are also super keys of the relation PERSON as their combination is also unique for each record.
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
what do you mean by primary key constraint?
Which method is used to key transformation ? A hash method is used to key transformation.
please describe the data base management with the easy example &give the application?
What is E-R model? This data model is based on real world that having of basic objects called entities and of relationship between these objects. Entities are explained in a da
Describe Dynamic Model. The dynamic model specifies allowable sequences of changes to the objects from an object model. It contains event trace diagrams describing scenarios. A
i am not clear with the climetic condition of the north indian plain. can u plz explain it for me
What is the purpose of storage manager? The storage manager is responsible for the following a) Interaction with the file manager b) Translation of DML commands in to low
Data Control The data control mostly refers to commands that permit system and data privileges to be passed to several users. These commands are usually available to database admi
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