How to loop selected records on grid for form in dynamics ax?

To loop/iterate selected records from grid on form you can use following code, this can be done on clicked method of button control :

InventTable inventTableBuffer;

for (inventTableBuffer = getFirstSelection(InventTable_ds);

inventTableBuffer;

inventTableBuffer = InventTable_ds.getNext())

{

    // write logic here.

}

Get worker name from position with SQL Queries

select top 1 name from DIRPARTYTABLE
inner join HcmWorker ON HcmWorker.PERSON = DIRPARTYTABLE.RECID
AND HcmWorker.RECID = 
    (select top 1 worker from HCMPOSITIONWORKERASSIGNMENT  
    INNER JOIN HCMPOSITION ON HCMPOSITIONWORKERASSIGNMENT.POSITION =  HCMPOSITION.RECID
    AND HCMPOSITION.POSITIONID = 'PositionId'
    where GETDATE() between HCMPOSITIONWORKERASSIGNMENT.VALIDFROM 
    AND HCMPOSITIONWORKERASSIGNMENT.VALIDTO);

Find Company details in Dynamics AX

Company Address:

CompanyInfo companyInfo = CompanyInfo::find();
info(strFmt("%1",companyInfo.postalAddress().Address));

Currency details:

CompanyInfo::standardCurrency() 

	OR

Ledger::accountingCurrency(CompanyInfo::current());