I want to write an online database that displays 4-generation pedigrees. Can anyone point me to a tutorial/web site on how to do this? I've written several online databases in asp, but can't figure out how to do this particular algorithm. Any help appreciated.
Basically I have a list of about 400,000 horses each with a unique ID code. In each individual horses record there is its mother and father identified by their ID codes. ie; three columns, the horse's ID, and it's mother and father's ID. So, when you display a horses four generation chart, it should all link uphorse, mother father, grandparents, great-grandparents etc.. It should be a common database task, but Ive searched everywhere on the web and in various books and cant find how to write and link up the SQL statements. Any help/pointers would be appreciated. cheersYour table design should be similar to the following:
Horse Id,Horse Detail,Fathers Id, Mothers Id
Using SELF JOIN (Relating the table to itself by aliasing) you can derive any number of elements in a hierarchy.
e.g. Data
Horse Id | Horse Detail | Father Id | Mother Id
1 | ABC | |
2 | DEF | |
3 | GHI |1 |2
4 | JKL |1 |2
5 | MNO | |
6 | PQR |1 |5
An addtional field Sex (F/M) may be useful for your application
Hope this helps.
Showing posts with label online. Show all posts
Showing posts with label online. Show all posts
Friday, March 30, 2012
Wednesday, March 21, 2012
pattern matching
hullo all,
well i need to read pages online using webclient or httmpweb classes
and store them in string builder to perform further string operations.
any idea regarding its code
This seems more like an application issue. You might try posting on one of the pertinent .NET forums.|||ummm well ur qoute proves true..
thanks
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