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What are the three classes of SQL expression?
SQL expression consists of three clauses:
Select
From
Where
WHAT IS MEANT BY E-R MODEL
real life situations where database management system are most suitable
define lock conversion
Discuss the term- Design Optimization We have seen various ways of representing the objects.The fundamental design model uses analysis model as the framework for implementati
er diagram on cosmetics.
What are the benefits of decomposing a system? The benefits of decomposing a system into subsystems are that after decomposition, each individual component become smaller and e
Explain the integrity constraints: Not Null, Unique, Primary Key with an example each. Is the combination 'Not Null, Primary Key' a valid combination. Justify. Not Null - Shou
What is recursive closure? Why is it not possible to describe this operation in relational algebra? Recursive closure is applied to recursive relationship. An instance of rec
Explain the Log Based Recovery Method? The system log that is generally written on stable storage consists of the redundant data required to recover from volatile storage failu
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
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