How to use Not Exists Join in Axapta 2012

You can use Not Exists Join in Axapta 2012 following way.

 LedgerTable ledgerTable;  
 LedgerTrans ledgerTrans;  
 while select AccountNum, Name from ledgerTable  
 notExists join * from ledgerTrans where (ledgerTable.AccountNum == ledgerTrans.AccountNum)