Tree Walking in Oracle

hello.
For performing tree walking in Oracle we use start with, Connect by and "Prior" in Select query...
can you please provide me little explanation of all these 3 key words.

Thanks a lot.
soodrajni123Asked:
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Helena MarkováConnect With a Mentor programmer-analystCommented:
I think that this part of Oracle documentation explain you all (the registration is free):
http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a85397/expressi.htm#1023748
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