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Explain the Project-Join normal form
A relation R is in PJNF along with respect to a set of functional dependencies D if for all join dependencies of the outline *(R1, R2, ...,Rn) and R = R1 U R2 U ..., URn at least one of the subsequent holds:
*(R1, R2, ...,Rn) is trivial
Each Ri is a superkey of R
#quCreate a database design specification (Enhanced Entity Relationship Diagram (EERD) and Relational Data Model (RDM)) from the given business description. The RDM must be in 3rd
What do you understand by ACID? - ACID (Atomicity Consistency Isolation Durability) is a quality sought after in a reliable database. Here's the relevance of each quality:
A well-maintained relational DBMS has a high level of data integrity. What features of a relational DBMS contribute towards this level of integrity? Relational DBMS gives high
What is a PROJECT operation? The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).
Describe integrity constraints? Integrity Constraints - A database is just as excellent as the information stored in it, and a DBMS must therefore help avoid the entry of inc
what is union compatable?
What are the two types of blocks in the fixed -length representation? Define them. Anchor block: Have the first record of a chain. Overflow block: Have the records other tha
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
HOW MANY TYPES OF VIEWS
give some example real life situation where DBMS are most suitable
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