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What is called query processing?
Query processing refers to the range of activities included in extracting data from a database.
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
1. Create the tables for the play-scheme database as specified in the TMA. 2. Enter the data as given in the spreadsheet. 3. Create queries to retrieve specified information
explain concept of decomposition?
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
Task Partitioning, Sequencing and Project Planning The tasks required for the service might be broadly partitioned into: 0. Set up database tables and account file
non numeric literals
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
want a idea for final year project
Explain retrieval in QBE? Retrieval in QBE : A "GUI" for expressing queries. Based on the Domain Relational Calculus (DRC) Actually invented before GUIs. Very co
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