copy template data sets into same table - sql

Question

I'm searching for a sql query that copy entries based on a template into the same table.
the simplified table looks as follows:
product | model | version | attribute | attributeValue
----------|--------|----------|---------------|----------------
A | 1 | 0 | price | 1000
A | 1 | 0 | token | 1
A | 1 | 0 | spc_weight | 130
A | 1 | 0 | spc_volume | 150
A | 1 | 0 | spc_diameter | 12
A | 1 | 0 | colour | blue
A | 1 | 1 | price | 1100
A | 1 | 1 | token | 1
A | 1 | 1 | spc_weight | 130
A | 1 | 1 | spc_volume | 150
A | 1 | 1 | spc_diameter | 12
A | 1 | 1 | colour | blue
B | 1 | 0 | price | 800
B | 1 | 0 | token | 1
B | 1 | 0 | spc_weight | 135
B | 1 | 0 | spc_volume | 150
B | 1 | 0 | spc_diameter | 12
B | 1 | 0 | colour | red
B | 2 | 0 | price | 800
B | 2 | 0 | token | 1
B | 2 | 0 | spc_weight | 140
B | 2 | 0 | spc_volume | 150
B | 2 | 0 | spc_diameter | 12
B | 2 | 0 | colour | red
C | 1 | 0 | price | 800
C | 1 | 0 | token | 2
C | 1 | 0 | spc_weight | 135
C | 1 | 0 | spc_volume | 155
C | 1 | 0 | spc_diameter | 12
C | 1 | 0 | colour | green
i have also created here the table --> http://sqlfiddle.com/#!18/c6b01/3
what's the template? the template product (product+model+version) is user defined.
what data should be copied? all spc_% attributeValue from template product
where should the data be copied? the attributeValue from the template needs to copied into the corresponding attribute from all product that have the same token attribute and are the latest version.
what I have at the moment is
get the template data
select attributeValue from product
where product='B' and model =1 and version =0 and attribute like 'spc_%'
what products are affected
select product, model, max (version) as version from product
where attribute='token' and attributeValue='1'
group by product, model
so the solution in that case would be that all the attribute spc_% for product A model 1 version 1 and product B model 2 version 0 are populated with the attributeValue from the template product b model 1 version 0
thats how the table should look after the update. the values with * are the one that should have been updated based on the template.
product | model | version | attribute | attributeValue
----------|--------|----------|---------------|----------------
A | 1 | 0 | price | 1000
A | 1 | 0 | token | 1
A | 1 | 0 | spc_weight | 130
A | 1 | 0 | spc_volume | 150
A | 1 | 0 | spc_diameter | 12
A | 1 | 0 | colour | blue
A | 1 | 1 | price | 1100
A | 1 | 1 | token | 1
A | 1 | 1 | spc_weight | 135*
A | 1 | 1 | spc_volume | 150*
A | 1 | 1 | spc_diameter | 12*
A | 1 | 1 | colour | blue
B | 1 | 0 | price | 800
B | 1 | 0 | token | 1
B | 1 | 0 | spc_weight | 135
B | 1 | 0 | spc_volume | 150
B | 1 | 0 | spc_diameter | 12
B | 1 | 0 | colour | red
B | 2 | 0 | price | 800
B | 2 | 0 | token | 1
B | 2 | 0 | spc_weight | 135*
B | 2 | 0 | spc_volume | 150*
B | 2 | 0 | spc_diameter | 12*
B | 2 | 0 | colour | red
C | 1 | 0 | price | 800
C | 1 | 0 | token | 2
C | 1 | 0 | spc_weight | 135
C | 1 | 0 | spc_volume | 155
C | 1 | 0 | spc_diameter | 12
C | 1 | 0 | colour | green
thats where I stuck right now. somehow I'm not able to write the inner join and then the update function.
anyone some advice?
it seems that this sql does the job:
with templateCTE as ( select attribute, attributeValue
from product
where product='A'
and attribute like 'spc_%'
and model=1
and version=0),
productsToUpdate as ( select product, model, max (version) as version from product
where attribute='token' and attributeValue='1'
group by product, model ),
selectionToJoin as (select productsToUpdate.product, productsToUpdate.model,productsToUpdate.version, product.attribute, product.attributeValue from productsToUpdate
inner join product on productsToUpdate.product = product.product and productsToUpdate.model= product.model and productsToUpdate.version= product.version)
UPDATE P1
SET P1.[attributeValue] = P2.[attributeValue]
FROM selectionToJoin P1
JOIN templateCTE P2 ON P1.[attribute] = P2.[attribute]
COMMIT;
SELECT * FROM product
regards

Answer 1

You can first select the source rows using a sub query then use join the product table using that resultset. Below update query will work for you -
WITH CTE AS (SELECT [attribute], [attributeValue]
FROM product
WHERE [attribute] LIKE 'spc_%'
AND [product] = 'B'
AND [model] = 1
AND [version] = 0)
UPDATE P1
SET P1.[attributeValue] = P2.[attributeValue]
FROM product P1
JOIN CTE P2 ON P1.[attribute] = P2.[attribute]
Here is the fiddle.