Adding 2 Datasources in a query(join mode )

static void CustTableSales1(Args _args)

{

    Query       query;

    QueryRun    queryrun;

    QueryBuildDataSource    qbds1,qbds2;

    QueryBuildRange         qbr1,qbr2;

    CustTable               custTable;

    ;

    query   = new query();

    qbds1   =   query.addDataSource(tablenum(CustTable));

    qbds1.addSortField(fieldnum(custTable,AccountNum),Sortorder::Descending);

    qbr1    = qbds1.addRange(fieldnum(custTable,custGroup));

    qbr1.value(queryvalue('10'));

    qbr2    =  qbds1.addRange(fieldnum(custTable,Blocked));

    qbr2.value(queryvalue(CustVendorBlocked::No));

    qbds2   = qbds1.addDataSource(tablenum(SalesTable));

    qbds2.relations(false);

    qbds2.joinMode(joinmode::ExistsJoin);

    qbds2.addLink(fieldnum(CustTable,AccountNum),fieldnum(SalesTable,CustAccount));

    queryrun    = new queryrun(query);

    while(queryrun.next())

    {

        custTable   = queryrun.get(tablenum(custTable));

        info(strfmt('%1 – %2',custtable.AccountNum,custTable.name()));

    }

}