Get records from last hour

Try below query:

SELECT Field1, OrderFor, Writeback, Actshipdate, Orderstatus, receivedate, receivetime 
  FROM orderinfo, shippinginfo
  WHERE orderinfo.orderid = shippinginfo.orderid
    AND shippinginfo.custid = '37782'
    AND receivedate =  DATE(NOW())
    AND receivetime >= (sysdate-1/24);

try this !!

SELECT Field1, OrderFor, Writeback, Actshipdate, Orderstatus, receivedate, receivetime
    FROM orderinfo, shippinginfo
    WHERE orderinfo.orderid = shippinginfo.orderid
    AND shippinginfo.custid = '37782'
    AND receivedate =  DATE(NOW())
     AND receivetime > DATEADD(HOUR, -1, GETDATE())