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What is conceptual schema?
The schemas at the view level are known as subschema that describe dissimilar views of the database.
we need example of 2phase locking
Scenario 1: Power goes out after the first instruction. What happens?
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
wh
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Explain mechanism of nested queries? SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common u
Creating views with Replace option : This option is used to alter the definition of the view without recreating and dropping it or regranting object privileges previously granted o
How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
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Wait-die" scheme : The idea is based on non-preventive method. It is based on a simple rule: If Ti requests a database resource that is held by T
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