O M G.
https://www.simple-talk.com/sql/t-sql-programming/sql-server-apply-basics/
SO, SO helpful to understand how to restructure the LEFT OUTER JOINs in my Common Table Expression (CTE) to instead use User Defined Functions (UDFs) that return Table-Valued Functions (TVFs). Mr. Sheldon’s article brought everything together for me.
My CTE is extremely complex; I am working on a top-to-bottom BOM report based on 5 to 10 different TYPES of product structures. Why “5 to 10 different TYPES” instead of a definite number? Semantics. It depends whether you count alternate products of the same type as being the same type, or -since they must be joined by another relationship- another type of product. The various types generally store their data in the same 3-4 tables, but the relationships of the columns are controlled by other tables depending on the type, and by the schema. Some columns are used by only a few types, some columns are used in different ways by different types, different types store the same data in different places… it’s more complex than any other product structure I’ve run across. Here’s a breakout of the main types:
1: CCA
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3: Box (assembly)
4: Component of a Box, BOM, or CCA
5: Component of a CCA
6. Alternates of ANY of the above.