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Explain CNT in the respects of QBE ?
CNT: It is one of the aggregation commands given in QBE. It is used to identify number of tuples
how to design tables
In the architecture of a database system which external level used? In the architecture of a database system view external level used.
(a) Differentiate between information and data . (b) List and briefly explain five potential benefits of the database approach compared to conventional file systems. (c) Diff
#quCreate a database design specification (Enhanced Entity Relationship Diagram (EERD) and Relational Data Model (RDM)) from the given business description. The RDM must be in 3rd
The First Normal Form (1NF) Let us first describe 1NF: Definition: A relation (table) is in 1NF if 1. There are no duplicate tuples or rows in the relation. 2.
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
Types Of Indexes One of the words used during the file organisation is the term index. In this part, let us describe this term in more detail. We find the index of keywords
Create 1 experiment to demonstrate an aspect of query optimisation by using access-path structures (indexes), decomposition, or denormalisation. Once satisfied with your experiment
Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
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