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What are the disadvantages of relational approach?
Disadvantages of relational approach:• Substantial hardware and system software overhead• May not fit all business models• Can facilitate poor design and implementation • May promote "islands of information" problems
why are older data models are being replaced by new data models
10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the
What will be create when a primary key if combined with a foreign key? A primary key if combined with a foreign key it creates Parent-Child relationship between the tables that
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
What is database utility? Database utility is the interface among the ABAP/4 Dictionary and the underlying the SAP system.
Differentiate between a subquery and a join If we need to acquire information from one or more tables after that either subquery or join can be used. If the columns which are t
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
What are the types of storage devices? Primary storage Secondary storage Tertiary storage Volatile storage Nonvolatile storage
Which operator is used to compare a value to a list of literals values that have been specified? BETWEEN operator is used to compare a value to a list of literals values that h
A relation instance indicates as r is a collection of tuples for a given relational schema at a exact point of time. A relation state r of the relation schema R (A 1 ,A 2 ,.....
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