Thomas Kellerer <spam_eater@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