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What are the object-oriented approaches
Software systems which are designed with structured design methodology never support some of desired quality attributes for example reusability, mapping and portability to problem domain. Many large organisations have found that systems designed with structured approaches are less reusable and less maintainable than those which are designed with object-oriented approaches.
Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
Write A short note on temporary tables? Temporary Tables - Temporary tables exists solely for a particular session, or whose data persists for the duration of the transaction
What is serialization? Where it is used and why? Serialization is a basic term used for mechanisms which enable objects and object structures to be converted into portable for
Differentiate between natural join and outer join? Natural join is a binary operator which is written as (R * S) where as R and S are relations. The output of the natural join
Why containment is important in oosystems? Containment is an significant concept in oosystems because it allows dissimilar users to view data at different granularities.
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
What is difference between primary index and secondary index? Primary Index a) It is an ordered file whose records are of fixed length along with two fields. b) Only base
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Define garbage collection. Garbage may be formed also as a side effect of crashes. Periodically, it is essential to find all the garbage pages and to add them to the list of fr
why we fregment at all?
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