Converting table data into a look up matrix

Question

Converting table data into a look up matrix

DAve Broomhead

Old Hand

Points: 301
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October 8, 2005 at 7:52 am

#91751

HI
I'm developing a large price/stock control database. One function of the database is to produce a price list. I'm using MS Access to produce the pricelist, just by creating reports from ODBC data in the SQL database.
The problem i'm having is i need to produce a different type of report. So far the report are as follows:
Size          Product              Price
------------------------------------
25mm        Skylight                  £18.00
37mm        Skylight                  £18.00

I need to produce a report as follows :

                  25mm        37mm
-----------------------------
  Skylight     £18.00       £18.00

Basically a lookup matrix.
Im running out of ideas, can anyone help ? I've been using SQL server for about 18months, and have visual studio and office at my disposal.
Sorry if this is the wrong place this is my first post.

Thanks
DAve

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Farrell Keough SSCoach Points: 17414 More actions · Answer 1

Here is a bulldozer approach. Hopefully, someone will come up with something more efficient... (I added some data for a check, but I do not know how many [Size] entries you may have and hence how big your #OutPut table may get...

CREATE TABLE #Products( [Size] varchar(5),

Product varchar(10),

Price varchar(10))

INSERT INTO #Products VALUES( '25mm', 'Skylight', '£18.00')

INSERT INTO #Products VALUES( '37mm', 'Skylight', '£18.00')

INSERT INTO #Products VALUES( '25mm', 'MoonLight', '£13.00')

INSERT INTO #Products VALUES( '37mm', 'MoonLight', '£15.00')

CREATE TABLE #OutPut( Product varchar(10))

DECLARE @SQL varchar(2000)

SELECT @SQL = ( 'INSERT INTO #OutPut ' + CHAR(10) +

'SELECT DISTINCT Product ' + CHAR(10) +

'FROM #Products ')

EXEC( @SQL)

DECLARE @CurrentProduct varchar(10),

@MaxProduct varchar(10),

@CurrentSize varchar(5),

@MaxSize varchar(5)

SELECT @CurrentProduct = (SELECT MIN( Product) FROM #OutPut)

SELECT @MaxProduct = (SELECT MAX( Product) FROM #OutPut)

SELECT @CurrentSize = (SELECT MIN( [Size]) FROM #Products WHERE Product = @CurrentProduct)

SELECT @MaxSize = (SELECT MAX( [Size]) FROM #Products WHERE Product = @CurrentProduct)

WHILE @CurrentProduct <= @MaxProduct

BEGIN

WHILE @CurrentSize <= @MaxSize

BEGIN

SELECT @SQL = ('ALTER TABLE #OutPut ADD [Size ' + @CurrentSize + '] varchar(10) NULL ') + CHAR(10)

EXEC( @SQL)

--PRINT @SQL

SELECT @SQL = ('UPDATE #OutPut SET ' + CHAR(10) +

' [Size ' + @CurrentSize + '] = P.Price ' + CHAR(10) +

'FROM #Products P ' + CHAR(10) +

' INNER JOIN #OutPut O ON( P.Product = O.Product)' + CHAR(10) +

'WHERE ' + CHAR(39) + @CurrentSize + CHAR(39) + ' = P.[Size]') + CHAR(10)

EXEC( @SQL)

--PRINT @SQL

SELECT @CurrentSize = (SELECT MIN( [Size]) FROM #Products WHERE @CurrentProduct = Product AND [Size] > @CurrentSize)

END

SELECT @CurrentProduct = (SELECT MIN( Product) FROM #OutPut WHERE Product > @CurrentProduct)

SELECT @CurrentSize = (SELECT MIN( [Size]) FROM #Products WHERE @CurrentProduct = Product AND @CurrentSize > [Size])

END

SELECT * FROM #OutPut

DROP TABLE #Products

DROP TABLE #OutPut

I wasn't born stupid - I had to study.

DAve Broomhead Old Hand Points: 301 More actions · Answer 2

HI,

Thanks a million this looks like the key, I'll give it a bash and if i'm still having probs i'll come back with more details on the tables etc.

Thanks again

Dave