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Set operations UNION, INTERSECT, and EXCEPT in MariaDB

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Set operations UNION, INTERSECT, and EXCEPT in MariaDB
FOSDEM 2021

The presentation will show how and why use UNION/INTERSECT/EXCEPT. How combine them to get expected result.

We will also dive into implementation details (with the help of the EXPLAIN command) to understand how MariaDB executes these set operators. This will help in understanding and troubleshooting performance problems.

Speakers: Oleksandr Byelkin