Foxhound Systems Blog

Foxhound Systems is a custom software development company in Chicago that specializes in building fast, reliable, and intuitive software systems for companies across industries, with solutions serving millions of users globally.

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Systems & Performance 1 Software Engineering 1 Programming Languages 1 Databases & Data 1

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Speeding up SQL queries by orders of magnitude using UNION

2021402 points156 comments Databases & Data details

SQL's UNION operation isn't usually regarded as a way to optimize query performance, but in many cases it can be used to achieve massive improvements in speed.