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Which database object does not physically exist?
A view database object does not physically exist.
explain the mapping constraints
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
In which format database schema is written ? Data base schema is written in the DDL format.
What is the major advantage of object-oriented programming paradigm? The ability to modify the explanation of an object without affecting the rest of the system is the main adv
What are the Requirements of algorithm designer Algorithm designer should: i) Select proper algorithm so as to minimize implementation cost ii) Find most appropriate d
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
Benefits and Limitations od Data Models?
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
What are the authentication modes in SQL Server? How can it be changed? Windows mode and Mixed Mode - SQL and Windows. To alter authentication mode in SQL Server click Start, P
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