Archive for February, 2009
From Stack Overflow:
Ok, i've been trying to solve this for about 2 hours now... Please advise:
PROFILE [id (int), name (varchar), ...]
SKILL [id (int), id_profile (int), id_app (int), lvl (int), ...]
APP [id (int), ...]
The lvl can basically go from 0 to 3.
I'm trying to get this particular stat: "What is the percentage of apps that is covered by at least two people having a skill of 2 or higher?"
Thanks a lot
We actually need to count ratio here:
(apps that have 2 or more skills with level 2+) / (total number of apps)
This is one of not so common cases when
AVG aggregate apparently comes handy.
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