Notes for A.3.2 User Interaction with Databases - IB | RevisionDojo
A.3.2 User Interaction with Databases Notes
End-users interact with databases through queries, which are requests for specific data or actions.
There are several methods for querying databases, each catering to different user needs and technical expertise.
SQL (Structured Query Language)
SQL is a powerful language used to manage and manipulate relational databases.
It allows users to perform tasks such as retrieving data, updating records, and managing database structures.
Many database management systems support SQL, making it a universal tool for databaseinteraction.
Example
SELECT * FROM Students WHERE Grade > 90;
Tip
SQL is widely used because it is both powerful and relatively easy to learn.
QBE (Query By Example)
QBE is a graphical query language that allows users to build queries by providing examples of the data they seek.
It is designed for users who may not be familiar with SQL syntax.
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Definition
Paywall
(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.
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Note
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Tip
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What is a query in the context of databases?
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Note
User Interaction with Databases
End-users interact with databases through queries, which are requests for specific data or actions.
There are several methods for querying databases, each catering to different user needs and technical expertise.
DefinitionQueryA request for specific data or actions from a database.
AnalogyThink of a query like a search engine request - you input what you're looking for, and the system returns the relevant information.
ExampleWhen you search for a product on an online store, you're essentially making a query to their database.
