AX / Dynamics 365 For Finance and Operations blog

static void QueryExample(Args _args)
{
    Query                   query;
    QueryBuildDatasource    datasource;
    ;

    query = new Query();

    // Add SalesTable main datasource
    datasource = query.addDataSource(tableNum(SalesTable));

    // Add child datasource "SalesLine" to previously created DS
    datasource = datasource.addDataSource(tableNum(SalesLine));

    // Set the join mode
    datasource.joinMode(JoinMode::InnerJoin);

    // Indicate you don't want to use relations automatically
    datasource.relations(false);

    // Add link between parent field and child field
    datasource.addLink(fieldNum(SalesTable, SalesId),
        fieldNum(SalesLine, SalesId));

    info(query.xml());
}