What are Queries, and why should we use them

Dynamics 365 Business Central

A query object in Business Central is used to collect and read data from SQL, allowing for the retrieval of data from multiple tables in one dataset.
Different SQLJoinTypes can be specified to define how data from different tables is combined, including Inner Join, Left Outer Join, Right Outer Join, Full Outer Join, and Cross Join.
Query objects are useful when developing for Business Central to collect data from multiple sources, run queries for data analysis, populate report datasets, serve as a data source for a page, or expose as a web service/API.
The AZ AL Dev Tools extension within VS Code can be used to create new objects with a user interface to guide through necessary properties, or the tquery command can be used to create a Query API object.
Leveraging queries in Business Central development is beneficial for database developers, allowing for efficient data collection and analysis across multiple tables.
Queries can be used for various purposes such as analyzing data, creating reports, populating pages, and serving as APIs.
When developing with queries, it is important to understand different SQLJoinTypes and their implications on data retrieval and combination.
Utilizing queries can streamline data collection and processing tasks in Business Central, providing a faster and more efficient way to work with data.

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