Question

Pivot on a bitwise field

Asked by: hpet

I need some help, please.

I have attributes table that simply stores "attribute_id", "attribute_name" and "attribute_value".
Attribute values are 1, 2, 4, 8, 16, ... because they will be used in another table as integer... bitwise. Master table contains some fields + attribute field (bitwise).

What I need to get is a result that will show attributes as columns:
master.field1, master.field2, [attribute1], [attribute2], [attribute3], ...

On top of all it should be dynamic in case new attributes are added to the attributes table.
But at least if I get some static example it should get me going.

Thank you!

I am strugling with some pivot examples I found but no luck.

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Asked On
2009-07-27 at 01:46:08ID24602208
Topics

SQL Server 2005

,

SQL Server 2008

Participating Experts
1
Points
250
Comments
2

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Answers

 

by: momi_sabagPosted on 2009-07-28 at 21:08:53ID: 24967110

hi
i don't believe you will be able to do what you want for 2 reasons:
1) the pivot statement has to have a fixed list of values, thus it can't be static, you will have to dynamically build it using the list of possible values you wish to see
2) since bitwise fields are not discrete (that is, they have a range - the attribute 1 will exist for all odd numbers) pivot can't really help you here

what i would try to do is to create a dynamic query that will seperate the values into multiple columns and then try to work with it, for example
1. get max(bitwise field)
2. log2 on that value will give number x
3. generate a select statement with x columns from 1 to x, each performing an bitwise add operation with the string 0000000i000 (where i is between 1 and x)

 

by: hpetPosted on 2009-08-10 at 03:41:13ID: 25058598

Sorry for a delay.... well deserved vacations.

For now I will go with solution similar to attached code snippet. Query might be a bit different as question above, but idea works (code snippet reflects my real case a bit more). Pivot list is not dynamic, but query statement will be dynamicaly created as a workaround.

I will optimize it when I get around it.

Thanks!

SELECT 
  db_id, 
  left(convert(varchar(20),modified,121),10) As date,
  Sum([2]) As 's1',
  Sum([3]) As 's2',
  Sum([4]) As 's3',
  Sum([5]) As 's4',
  ...						
 
FROM 
  (SELECT 
     adr.*, 
     atr.id, atr.name, atr.value
   FROM address AS adr
   JOIN attribute AS atr ON adr.flags & atr.value > 0
 
WHERE adr.db_id = '1') AS PNT
PIVOT (
  Count(value)
  FOR id IN([2], [3], [4], [5], ...)
) AS PVT
GROUP BY db_id, left(convert(varchar(20),_modified,121),10)
                                              
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