if i have several rows in a table and i want some to have certain weights
what is the best way to pick a random row based on its weight?

ex of table:
id    weight
1     10
2    5
3    3
4    20
5    2

therefore, since there is a total weight of 40, id 1 should be picked 25%
(10/40) of the time, id 4 50% (20/40), etc...

what is the best way to do this?

- Noah

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