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Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
What is data model? Explain object based and record based data models? Ans: A data model is an abstract model in which describes how data is represented and accessed. (i)
What is the role of ORDER By Clause? ORDER BY clause: The ORDER BY clause permits you to sort the records in your result set. The ORDER BY clause can just be used in select s
What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
Define Network DBMS The NDBMS is built primarily on a one-to-many relationship, but where a parent-child representation between the data items cannot be ensured. This may occur
If R1 and R2 are two relations or functions, then the result of R3 = R1 × R2 is the combination of tuples that are in R1 and R2. The product is associative and commutative. Degr
What is inheritance? Define it in detail? Inheritance Inheritance can be at the levels of types, or at the level of tables we first consider inheritance of types, then i
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Design a gennalization and specialization hierarchy for an automobile sales company
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