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What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
define locking in simple language and decribed it
a brief definition
external and internal mapping with examples
Explain Growing Phase of locking Growing Phase: In this phase the transaction can only obtain locks, but cannot release any lock. The transaction enters the growing phase as so
What is NULL? Give an example to described testing for NULL in SQL? The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a re
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
What are shortcomings in structured approach? Structured methodology treats data and their behaviours separately, and this makes it harder to isolate changes. If changes are re
explain normalisation
Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?
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