Queries - a (one) way of retreiving data from the data base.
How to get data in AX: 1. Views, 2.Queries 3.Select statement.
helps when ranges or values are not known until run time.
in forms + reports + places where data is retreived from multiple data sources.
How to create?
1. AOT > Queries : (aka static queries) this node has predefined static queries, and you can add queries (Right Click on AOT\Queries node >Add Query)
Methods: customize or override methods of QueryRun class
DataSources: can be table, map, view --- and each of them can be nested as parent and child
Fields: check the Dynamics[property] : Yes mean all fields are displayed; No means you can pick fields
Range: to limit records for a given Range expression. ex: "1000" "1000..3000" "<2000" ">=4000" etc
GroupBy: only specific field combinations.
OrderBy: sort order to sort results. ex: ascending descending.
DataSources: can nest multiple data sources and link them using relations. (see pic below)
Relations: to set the join mode between the tables like Inner, Outer etc.
Dependent Object: All AOT nodes that refer the query are displayed here. ex: Forms, reports and other affected objects.
Composite Query: query based on another query. It is like inheritance. Usually used to override or add further ranges.
2. x++ dynamic Queries:
check the next blog post.