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What is inheritance?
Inheritance is an object orientation concept that allows reusability of code / design. Basic sense of inheritance is that if one class is predefined than another class which also passes property of existing class can be defined and can inherit the property of existing class. Such as, if a class named student is defined and another class for Post Graduate students is to be defined then PG Student class could inherit student class.
why are older data models are being replaced by new data models
What are the advantages and disadvantages of merging an association into a class? Advantages: i) Less number of tables ii) Faster performance due to the fewer tables
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
Give the two reasons for allowing concurrency
Create an index for the table Client, field CLIENT_NO of Q ? Command: CREATE INDEX client_client_no ON client(client_no);
Determine the advantage of object-orientation Finally, object-orientation has advantage of continuity throughout analysis, persistent representation and design implementation.
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
Why is need for the multiple access paths?
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