SQL Server 2008 - Avoiding a foreach loop - sql-server-2008

Question

I am trying desperately to avoid a foreach situation in SQL Server 2008 (my background is in c#).
Basically, I have a list of SKUs. For each SKU in the list, I need to perform some calculations that determine if that particular SKU will be displayed on the web.
To get my list of SKUs, I use this:
SELECT Feed.StyleCode as SKU
FROM [eCommerce].[dbo].[BABW_ItemFeed] as Feed
WHERE Feed.ProductDefinition = 'Kit'
Returning this:
And to calculate each SKUs fields, I've been using this:
DECLARE #SKU AS varchar(50)
SET #SKU= '11993_16559_16227'
SELECT
#SKU as SKU,
0 AS Quantity,
MIN(ISNULL(Sending.IsActive, 'WEBNO')) AS IsActive,
MAX(ISNULL(Sending.IsDiscontinued, 1)) AS IsDiscontinued
FROM
(
SELECT * FROM [eCommerce].[dbo].[Split] (
#SKU
,'_')
) AS SplitSkus
LEFT JOIN #SkusToSend AS Sending
ON Sending.SKU = SplitSkus.items
Returning this:
Now I need to synch the two tables together, removing the #SKU declaration. I don't think I'm able to use a UNION to do this, because the second function requires fore-knowledge of the SKU it will be processing... and a JOIN would require something to join on, which I don't really have. Is there some function I'm not familiar with that I can use to create a complete table of SKUs in one go without a looping mechanism?

Answer 1

Try a CROSS APPLY... which will execute your UDF for each row in BABW_ItemFeed:
SELECT
Feed.StyleCode as SKU,
COUNT(*) AS Quantity,
MIN(ISNULL(Sending.IsActive, 'WEBNO')) AS IsActive,
MAX(ISNULL(Sending.IsDiscontinued, 1)) AS IsDiscontinued
FROM
[eCommerce].[dbo].[BABW_ItemFeed] as Feed
CROSS APPLY [eCommerce].[dbo].[Split] (Feed.StyleCode, '_') AS SplitSkus
LEFT JOIN #SkusToSend AS Sending
ON Sending.SKU = SplitSkus.items
WHERE
Feed.ProductDefinition = 'Kit'
GROUP BY
Feed.StyleCode

Answer 2

Stop using Min() and Max()...or else, pull SKU (don't use the parameter in the SELECT).
Try This:
SELECT
SKU,
0 AS Quantity,
MIN(ISNULL(Sending.IsActive, 'WEBNO')) AS IsActive,
MAX(ISNULL(Sending.IsDiscontinued, 1)) AS IsDiscontinued
FROM
(
SELECT [eCommerce].[dbo].[Split] (Feed.StyleCode,'_') as SKU
FROM [eCommerce].[dbo].[BABW_ItemFeed] as Feed
WHERE Feed.ProductDefinition = 'Kit'
) AS SplitSkus
LEFT JOIN #SkusToSend AS Sending
ON Sending.SKU = SplitSkus.items