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What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
Hierarchical
External failure : A failure can also result because of an external cause, such as earthquakes, fire, floods, etc. The database must be duly backed up to avoid troubles occurring d
Question 1 Discuss the classification of DBMS based on location of database Question 2 Explain with examples different SQL commands used for creating and deleting relations.
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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.
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data models are being replaced over years. Reasons and why does that happen?
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