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List and also explain the dissimilar stages of DDLC ?
what are information system hirarchy?
Write short notes on data ware housing? Data ware housing applications needs the transformation of data from many sources into a cohesive reliable step set of data configured a
what is natural join?
job scheduling for different cubes
Let us now make the E-R diagram for the student database as per the explanation given in the previous section. We can also states the overall logical structure of a database usi
Relational and E-R Model There are three types of constraints on relational database that have: DOMAIN CONSTRAINT PRIMARY KEY CONSTRAINT INTEGRITY CONSTRAINT
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
What is NULL? Simply NULL means not in value.
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