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Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
Meaningful use refers to the use of certified EHR technology to "enhance quality, efficiency, and reduce health disparities
Differance between DDL and SDL? DDL and SDL - The data definition language (DDL) is used through DBA and database designers to describe internal schema, conceptual schema, and
what is cascading? what is rollback cascading? please explain in detail
What is relationship instance ? Relationship Instance - A relationship is a relation between two or more entities. An instance of relationship set is a set of relationships.
Which database object does not physically exist? A view database object does not physically exist.
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
explain concept of decomposition?
While using extract datasets it is required to have a special workarea for interface False. It is not required to have a special workarea for interface
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