<Column FieldName="c.BDATE" DbGridField="BDATE" Caption="订购起始日期" Width="110" SummeryFooterType="null" />
   <Column FieldName="c.PRICE" DbGridField="PRICE" Caption="订购单价" Width="70" SummeryFooterType="null" />
   <Column FieldName="c.BQTY" DbGridField="BQTY" Caption="订购数量" Width="70" SummeryFooterType="null" />
订购起始日期+订购数量，得出“订购结束日期”，增加显示之。