吉斯床垫怎么样:CONNECT BY PRIOR 的问题

来源：百度文库编辑：高考问答时间：2024/04/29 08:14:30

①．
===========================================================
START WITH ZY22》FATHER ＝画面》FATHER
ZY22》CDJ＝画面》CDJ
ZY22》day_start≤NVL(画面》day,'99999999')
ZY22》day_end≥NVL(画面》day,'00000000')
CONNECT BY PRIOR ZY22》SON＝ZY22》FATHER
PRIOR ZY22》CDJ＝ZY22》CDJ
ZY22》day_start≤NVL(画面》day,'99999999')
ZY22》day_end≥NVL(画面》day,'00000000')
===========================================================
请帮忙分析一下这段SQL文。。谢谢。。
自己做了几个实验，还是不能透彻的搞懂。。。。

②．关于“CONNECT BY PRIOR ZY22》SON＝ZY22》FATHER”这句，
要是写为“CONNECT BY PRIOR ZY22》FATHER＝ZY22》SON”，
结果会不一样吗？做实验时好像结果是一样的。。
我就郁闷了，我觉得父子关系写反的话，出来结果的顺序也
应该是反的才对。。。

请高手知道！
谢谢！
参考文:
http://zhidao.baidu.com/question/2045639.html

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