Explore how CTEs and subqueries perform in complex SQL queries and learn best practices for database administration.

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I have the following CTE's, and I'm trying to combine XML1 and XML2 CTE's in Sql Server by their common refid key.

Many modern SQL servers support Common Table Expressions (CTE) feature that allows you to declare a temporary named result set derived from a query and use it in the from part of another query. This ...