How and why does CTE give better performance compared to views / subqueries / temp tables, etc.?
Any temporary calculations occur in a temporary database. Therefore, if we have a cursor approach, it also creates a temporary table / work table in a temporary database, and as soon as the operation is completed, this worksheet will be destroyed. My understanding of CTE is that it also does the same (or creates a temporary result in memory? And, therefore, improves performance). Then why is it better than the aforementioned approaches like table / cursor subqueries / views etc.?
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