Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

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oren@ravendb.net

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Couchbase vs RavenDB Performance at Rakuten Kobo Whitepaper

Aug 10 2007

SQL Challenge, getting historical data

time to read 1 min | 125 words

Here is an interesting problem that I had to face at work. I need to get historical data from this table. Basically, I need to count the number of opened bugs per months.

Id  OpenedAt   ClosedAt
--- ---------- -----------
1   2007-04-02  2007-09-01
2   2007-07-01  NULL
3   2007-07-01  2007-07-23

A solution to this with the data above should print (for 2007-04 to 2007-10):

Month	Year	Opened Bugs
4	2007	1
5	2007	1
6	2007	1
7	2007	2
8	2007	2
9	2007	1
10	2007	1

Have fun :-)

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