[img]http://dl.iteye.com/upload/picture/pic/123591/6ff1ef06-1130-3637-b720-64ba0e351dca.jpg[/img]
ROWID:记录每条记录在硬盘上位置的唯一标识
[img]http://dl.iteye.com/upload/picture/pic/123593/69a14531-d0da-31ac-8216-bd11b8665d38.jpg[/img]
ROWNUM:标识查询结果集中记录序号
[img]http://dl.iteye.com/upload/picture/pic/123595/696a7f74-a612-3611-a983-2822105027b4.jpg[/img]
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