Meta Stack Exchange is where users like you discuss bugs, features, and support issues that affect the software powering all 158 Stack Exchange communities.

What is meta?
Here's how it works:
  1. Any Stack Exchange user can ask a question
  2. The community provides support, votes on ideas, and reports bugs
  3. Your voice helps shape the way Stack Exchange operates

I'm wondering what the query is to calculate reputation. I know how to select the individual components of reputation but it seems pretty difficult to put them all together in one query...

Are there any examples out there that show this?

share|improve this question
up vote 3 down vote accepted

I'm just taking a wild stab at this since I don't really know anything, but it would seem that calculating reputation is an algorithm that can't easily be expressed as a SELECT query.

It involves many conditions that not only work on rows but on spans of rows within the set of data corresponding to your activity. For example, identical rows have to be treated differently depending on whether their timestamp is before or after you hit the reputation cap on a date, which itself is defined by the same set of rows.

Of course it's possible to do in SQL, just like it's possible to write Microsoft Word by hand in machine code, but it may be a situation where it's not worth the time to write such a complex thing when it's more easily expressed in other ways. gives you the breakdown without having to write a query if you just want to verify the components that went into your total.

share|improve this answer
@Dan, by other ways do you mean expressed as a denormalized field? – Mohamad Feb 8 '11 at 2:58
Yes, which is calculated either by a stored procedure, or a combination of C# and SQL. I expect it to be easier to calculate reputation using at least one loop rather than purely functional SQL. It's definitely not calculated on-the-fly as moderator actions routinely leave a user in a situation where their reputation is higher or lower than it would be if they click the 'recalc' button on the reputation page. – Dan Grossman Feb 8 '11 at 3:00
@Dan, that would imply a large number of queries, right? Using a loop, that is! – Mohamad Feb 8 '11 at 3:36
One query for your activity, then a loop over the results in which you calculate the reputation.That lets you keep track of whether you've reached the rep cap on each date as you move through the rows, and treat the rows after the cap differently than those before, until you reach the next day. – Dan Grossman Feb 8 '11 at 4:12
@Dan, thank you! This makes sense now. Although it seems interesting. I don;t think it's possible to dervice activity from the votes table. It would to be from the posts table which joins votes, no? – Mohamad Feb 8 '11 at 16:11
@Dan could you maybe merge your comments into your answer, as I think they'd complement it as a "well, if you do want to go the long way, here's a way to get started:" – Earlz Feb 8 '11 at 22:59
@Mel Don't forget that until 1000 reputation you now earn reputation for suggested edits which are accepted by two other users. Add that to (upvotes on questions, upvotes on answers, downvotes on questions, downvotes on answers, accepted answers, bounties awarded, bounties received) to keep track of. – Dan Grossman Feb 9 '11 at 1:20

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .