Notes for A.2.15 Simple and Complex Queries - IB | RevisionDojo
A.2.15 Simple and Complex Queries Notes
A query is a way to retrieve and manipulate data from a database.
Queries can be simple or complex , depending on the criteria and operations involved.
Definition
Simple Query
A query that retrieves data based on a single condition or criterion.
Definition
Complex Query
A query that retrieves data based on multiple conditions, often using logical operators like AND, OR, and NOT.
Boolean Operators in Queries
Boolean operators are used to combine multiple conditions in a query.
The most common operators are:
AND : Retrieves records that meet all specified conditions.
OR : Retrieves records that meet at least one of the specified conditions.
NOT : Retrieves records that do not meet a specified condition.
Example
AND: Find all students who scored above 80 in Math and Science.
OR : Find all students who scored above 80 in Math or Science.
NOT : Find all students who did not score above 80 in Math.
Parameter Queries
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Note
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Note
Introduction to Queries
A query is a way to retrieve and manipulate data from a database.
Queries can be simple or complex, depending on the criteria and operations involved.
DefinitionSimple QueryA query that retrieves data based on a single condition or criterion.
DefinitionComplex QueryA query that retrieves data based on multiple conditions, often using logical operators like AND, OR, and NOT.
AnalogyThink of a query like a search engine request. A simple query is like searching for a single keyword, while a complex query is like using multiple keywords and filters.
ExampleFinding all students who scored above 80 in Math is a simple query, while finding students who scored above 80 in Math and Science is a complex query.
