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What are the advantages of object oriented databases in comparison with others? Why it is still not widely used?
Object oriented designs are coherent, efficient and less prone to update problems which are not present in many other database design techniques currently. It is not used widely since only few the database vendors have supported it. It is still not in commercial stream. It is in development stage.
A database to track your progress in your college program will track your progress towards graduation! A database that has information containing the classes that you have taken, c
what are the reasons having variable length records
What are attributes? Give examples. An entity is shown by a set of attributes. Attributes are descriptive properties possessed by every member of an entity set. Example: pos
Implementation and SQL Applications
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
entity relationship diagram for online examination system
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
What is the use of group by clause? Group by clause is used to apply aggregate functions to a set of tuples. The attributes given in the group by clause are used to
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
WHAT IS DATABASE TECHNOLOGIES
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