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What subschema expresses ?
A subschema expresses the external view. (External schemas are called also called as subschemas)
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
Explain the EXEC statement in SQL Ans: All statements which start with EXEC SQL are embedded SQL database statements. High level languages such as C can be employed to write a
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
example of embedded SQL query
Explain TPS concurreny executions stating their advantages in online business advancement
Define Timestamp ordering Ans In timestamp-based method, a serial order is made among the concurrent transaction by assigning to every transaction a unique nondecreasing number
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
Explain algorithm of ER To Relational Mapping ? ER-to-Relational Mapping Algorithm: 1) Step 1: Mapping of regular entity types: For each strong entity type E, form a relatio
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
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