DuckDB with Hannes Mühleisen
Software Engineering Daily
Understand Union, Intersect, and the Complexity of SQL
SQL distinguishes between union and union all, with union eliminating duplicates and union all retaining them. Additionally, there's an intersect function that represents the theoretical intersection of sets, with the less well-known intersect all function that retains duplicates. SQL is recognized as a Turing complete language, particularly through the use of recursive common table expressions (CTEs), which adds complexity and the need for careful implementation. This complexity underscores the importance of correctly managing transactions in SQL, as users rightfully expect reliability in transaction handling.
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