programming collective intelligence by toby segaran. How schema works?

Asked Nov 12 '15 at 11:33

Active Nov 12 '15 at 11:33

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I am studying his schema but got confused how and to whom "fromid" from link is making a relation with inside urllist? or it is a misprint ? Its chapter 4 Searching and Ranking and figure 4-1. My eyes gone blind for as i have read so much but could not able to understand even the purpose of "fromid".

Here is the Book link as: http://www.uploadmb.com/dw.php?id=1447327761

Please help Thanks.

asked Nov 12 '15 at 11:33

user3440716

`fromid` and `toid` both reference the `rowid` in `urllist` - i.e. a `link` is from one URL to another. – jonrsharpe Nov 12 '15 at 11:36
then what does it shows. I mean do nt u think they then have same purpose? – user3440716 Nov 12 '15 at 11:47
What do you mean *"they then have same purpose"*? A link in that schema **connects two URLs**, so has an ID for each (`from` one `id`, `to` another `id`). What is unclear? – jonrsharpe Nov 12 '15 at 11:48
oh ok this means for example like in Google when i type Python so google picks up link from one id to another id? is that thing for example? – user3440716 Nov 12 '15 at 11:53
bcz in db i see (1,30) more than 2 times – user3440716 Nov 12 '15 at 11:54

programming collective intelligence by toby segaran. How schema works?

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