Thomas Kellerer <spam_ea...@gmx.net> writes:
> Merlin Moncure wrote on 31.10.2009 14:32:
>> an oracle guy wrote an sql statement that solves a sudoku
>> puzzle...using an oracle specific feature.  Still, it's pretty neat,
>> and an absolute gem of lateral thinking.
>> 
>> http://technology.amis.nl/blog/6404/oracle-rdbms-11gr2-solving-a-sudoku-using-recursive-subquery-factoring

> There is also a DB2 version:
> http://forums.devshed.com/db2-development-114/absolute-sudoku-solver-641065.html

The DB2 version looks amazingly brute-force :-(

I think the Oracle guy's version could easily be adapted to PG 8.4 ---
those little rownum subqueries seem to be just a substitute for not
having generate_series(1,9), and everything else is just string-pushing.
Don't have time to try it myself right now, though.

                        regards, tom lane

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