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Need to transpose some data - and not sure of the best way to do so - pivot table perhaps? Expand / Collapse
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Posted Monday, November 12, 2012 2:28 PM
Grasshopper

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So I have been reading up on pivot tables because I thought that was the direction I needed to go in. However - I am not aggregating any data. So let me first present my scenario - after that any insight would be appreciated.

I am creating a report for items that have an id as well as a material description. An item can exist multiple times with different types of material. Also - an item can have no more than 5 materials. For example:

item ID Material
337139 Ring-Band
337139 Ring-Artisan
337139 GOLD
337156 Acc-Tokens
337174 Ring-Gemstone
337174 Ring-Artisan
337174 SILVER
337183 Ring-Band
337183 MIXED METAL
337184 Earrings-Hoop
337184 MIXED METAL
337194 Earrings-Dangle
337194 SILVER

What I am looking to do is invert the data - so an item would only show up once followed by up to 5 materials.

item id Material 1 Material 2 Material 3 Material 4 Material 5
337139 Ring-Band Ring-Band Ring-Artisan
337156 Acc-Tokens
337174 Ring-Gemstone Ring-Artisan SILVER


Is there a way to transpose this then? Any help would be appreciated.

I have created some insert statements for the data:
create table materials (item_id int, materials varchar(35))
insert into materials values (337139,'Ring-Band');
insert into materials values (337139,'Ring-Artisan') ;
insert into materials values (337139,'GOLD');
insert into materials values (337156,'Acc-Tokens');
insert into materials values (337174,'Ring-Gemstone');
insert into materials values (337174,'Ring-Artisan');
insert into materials values (337174,'SILVER');
insert into materials values (337183,'Ring-Band');
insert into materials values (337183,'MIXED METAL');
insert into materials values (337184,'Earrings-Hoop');
insert into materials values (337184,'MIXED METAL');
insert into materials values (337194,'Earrings-Dangle');
insert into materials values (337194,'SILVER');
Post #1383879
Posted Monday, November 12, 2012 3:20 PM


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One thing i do when i need something like these requirements is create a consistent uniquifier using something like ROW_NUMBER() and have the base of my pivot something like this:

SELECT ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY (SELECT NULL)) as uniqifier, item_id, materials
FROM materials

Then i just take the MAX() for my row number for my pivot table "Aggregation".



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Post #1383892
Posted Monday, November 12, 2012 4:59 PM


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srobinson 596 (11/12/2012)
So I have been reading up on pivot tables because I thought that was the direction I needed to go in. However - I am not aggregating any data. So let me first present my scenario - after that any insight would be appreciated.

I am creating a report for items that have an id as well as a material description. An item can exist multiple times with different types of material. Also - an item can have no more than 5 materials. For example:

item ID Material
337139 Ring-Band
337139 Ring-Artisan
337139 GOLD
337156 Acc-Tokens
337174 Ring-Gemstone
337174 Ring-Artisan
337174 SILVER
337183 Ring-Band
337183 MIXED METAL
337184 Earrings-Hoop
337184 MIXED METAL
337194 Earrings-Dangle
337194 SILVER

What I am looking to do is invert the data - so an item would only show up once followed by up to 5 materials.

item id Material 1 Material 2 Material 3 Material 4 Material 5
337139 Ring-Band Ring-Band Ring-Artisan
337156 Acc-Tokens
337174 Ring-Gemstone Ring-Artisan SILVER


Is there a way to transpose this then? Any help would be appreciated.

I have created some insert statements for the data:
create table materials (item_id int, materials varchar(35))
insert into materials values (337139,'Ring-Band');
insert into materials values (337139,'Ring-Artisan') ;
insert into materials values (337139,'GOLD');
insert into materials values (337156,'Acc-Tokens');
insert into materials values (337174,'Ring-Gemstone');
insert into materials values (337174,'Ring-Artisan');
insert into materials values (337174,'SILVER');
insert into materials values (337183,'Ring-Band');
insert into materials values (337183,'MIXED METAL');
insert into materials values (337184,'Earrings-Hoop');
insert into materials values (337184,'MIXED METAL');
insert into materials values (337194,'Earrings-Dangle');
insert into materials values (337194,'SILVER');


Nicely done. I absolutely love it when someone takes the time to help me help them with readily consumable test data.

The following code will do what you ask. Keep in mind that an aggregate can be an aggregate of just one element. It employs what CapnHector was talking about.

WITH
cteEnumerateMaterials AS
(
SELECT item_id, materials,
Material# = ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY materials)
FROM materials
)
SELECT [Item ID] = item_id,
[Material 1] = MAX(CASE WHEN Material# = 1 THEN materials ELSE '' END),
[Material 2] = MAX(CASE WHEN Material# = 2 THEN materials ELSE '' END),
[Material 3] = MAX(CASE WHEN Material# = 3 THEN materials ELSE '' END),
[Material 4] = MAX(CASE WHEN Material# = 4 THEN materials ELSE '' END),
[Material 5] = MAX(CASE WHEN Material# = 5 THEN materials ELSE '' END)
FROM cteEnumerateMaterials
GROUP BY item_id
;



--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

"Change is inevitable. Change for the better is not." -- 04 August 2013
(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

Helpful Links:
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Post #1383912
Posted Tuesday, November 13, 2012 10:22 AM
Grasshopper

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Thanks for the responses guys - both worked well! You guys rock!
Post #1384185
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