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Solving SUDOKU thru SQL Code


Solving SUDOKU thru SQL Code

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Jus
Jus
Ten Centuries
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Recently i cross through one article where it says the following SQL Code used in oracle to solve SUDOKU Puzzles.

for 9x9 sudoku puzzles, the filled in numbers were passed as a string with a space for every unfilled square"
in the following example, string passed is '53 7 6 195 98 6 8 6 34 8 3 17 2 6 6 28 419 5 8 79' ( One space for every unfilled square, if 3 continuous boxes are unfilled, then there should be 3 spaces)



The following is the the code in Orcale used for the purpose.



with x( s, ind ) as
( select sud, instr( sud, ' ' )
from ( select '53 7 6 195 98 6 8 6 34 8 3 17 2 6 6 28 419 5 8 79' sud from dual )
union all
select substr( s, 1, ind - 1 ) || z || substr( s, ind + 1 )
, instr( s, ' ', ind + 1 )
from x
, ( select to_char( rownum ) z
from dual
connect by rownum <= 9
) z
where ind > 0
and not exists ( select null
from ( select rownum lp
from dual
connect by rownum <= 9
)
where z = substr( s, trunc( ( ind - 1 ) / 9 ) * 9 + lp, 1 )
or z = substr( s, mod( ind - 1, 9 ) - 8 + lp * 9, 1 )
or z = substr( s, mod( trunc( ( ind - 1 ) / 3 ), 3 ) * 3
+ trunc( ( ind - 1 ) / 27 ) * 27 + lp
+ trunc( ( lp - 1 ) / 3 ) * 6
, 1 )
)
)
select s
from x
where ind = 0
/


I request our SQL experts to convert this code into SQL Server compatible code to solve sudoku puzzles.


You can check the article about this @ http://technology.amis.nl/blog/6404/oracle-rdbms-11gr2-solving-a-sudoku-using-recursive-subquery-factoring


Regards
Jus
Lynn Pettis
Lynn Pettis
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Actually, I think you should give it a try first. If you run into problems, post what you have tried and we'll see what we can do to help you.

This looks like a good training opportunity to learn how to port code. Always a good thing to know.

Cool
Lynn Pettis

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Jus
Jus
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Lynn..you are right..I should have tried first. But when i saw the code i found few oracle objects like dual , connect which am unaware of...hence posted..this was not for any project..just out of curiosity i posted this....if any one can post solution, i can try comparing oracle vs sql server codes and will learn from there........thanks
SQLRNNR
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Late - but maybe still worth it. I'll be posting a blog on it shortly.

Jason...AKA CirqueDeSQLeil
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weitzera
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Just learned this yesterday, so I'll post a quick aside: Dual is a dummy object with one row.

select 'foo' from dual



is equivalent to the tsql statement

select 'foo'



which is invalid in ansi sql



Dan Guzman - Not the MVP (7/22/2010)
All questions have to be prefaced by Server version and 'according to MS Docs' or 'my own personal opinion based on how much detail I felt like digging into at the time.'

SQLRNNR
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Blog post sneak peek.

Jason...AKA CirqueDeSQLeil
_______________________________________________
I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Learn Extended Events

Lynn Pettis
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SQLRNNR (8/16/2011)
Blog post sneak peek.


Sneak peek didn't work, at least for me.

Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
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SQLRNNR
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Lynn Pettis (8/16/2011)
SQLRNNR (8/16/2011)
Blog post sneak peek.


Sneak peek didn't work, at least for me.


Crud - I had hoped it would since it worked for me. It is scheduled to post 8/17 at 6AM (Pacific)

Jason...AKA CirqueDeSQLeil
_______________________________________________
I have given a name to my pain...MCM SQL Server, MVP
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Learn Extended Events

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I don't care about solving SUDOKU with T-SQL. -- I like to do that myself. Does anyone have code to create guaranteed solvable SUDOKU puzzles?
bc_
bc_
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That is cool SQLRNNR.

I don't know if this would always work, but this at least works for the given puzzle to return it in 9 x 9:

SELECT TOP 9 SUBSTRING(s, ROW_NUMBER() OVER (ORDER BY s) * 9 - 8, ROW_NUMBER() OVER (ORDER BY s) * 9 - (ROW_NUMBER() OVER (ORDER BY s) * 9 - 8))
FROM x
WHERE ind = 0

bc
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