how can i filter latest data through x++ query

Hi all ,

i have a table called "Test" it having three fields 1.cust Account,2.Transaction Date,3.Amount and it having some data

customer CA-001 having two transaction.i need to filter latest transaction based on date only latest transaction should show in a form customer wise.i am writing excutequery method,how can i filter those data through x++ query.

thanks in advance....