In our ERP database, there is 1 table for products called PRODUCTS, which contains both kits and single SKU product information, and a table called PRODUCT_KIT_ITEMS that contain the relationships between kit SKUs and their components. In the PRODUCT table, each kit has a kit id on the parent SKU row and the PRODUCT_KIT_ITEMS table lists each component product id from the PRODUCTS table and the kit id of the parent SKU associated with it.
What I wanted was a list of all the SKUs of components associated with a parent SKU, both of which would be selected from the same column on the PRODUCTS table. This was the solution I came up with:
SELECT Parent.[PRODUCT_SKU] AS KitParent, Child.[PRODUCT_SKU] AS ChildSKU FROM [PRODUCT_KIT_ITEMS] JOIN (SELECT [PRODUCT_ID] ,[PRODUCT_SKU] FROM [PRODUCTS]) AS Child ON Child.[PRODUCT_ID] = [PRODUCT_KIT_ITEMS].[PRODUCT_ID] JOIN (SELECT [PRODUCT_ID],[PRODUCT_SKU],[KIT_ID] FROM [PRODUCTS] WHERE [KIT_ID] IS NOT NULL AND [KIT_ID] != 0) AS Parent ON Parent.[KIT_ID] = [PRODUCT_KIT_ITEMS].[KIT_ID] ORDER BY Parent.[PRODUCT_SKU];
I’m a bit of a newbie and was wondering if there was a better way to accomplish this, for instance, without running two subqueries on the PRODUCTS table.
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