http://download.oracle.com/docs/cd/B10501_01/server.920/a96540/queries4a.htm#2053937

这张图,很容易让人联想到现在的X销模式。
START WITH specifies the root row(s) of the hierarchy.CONNECT BY specifies the relationship between parent rows and child rows of the hierarchy. 来自 “ ITPUB博客 ” ,链接:https://blog.itpub.net/14517718/viewspace-1006329/ ,如需转载,请注明出处,否则将追究法律责任。