Change is the only constant…
I have a feeling that the name of my blog has never been so true :). Since today I work for Proton Technologies AG (https://protonmail.com, https://protonvpn.com). Still as a database engineer, but with completely different database engine – MySQL! Even though Oracle database is a…
How Well a Query Optimizer Handles Subqueries?
At the beginning of December, at the UKOUG Tech17 conference in Birmingham (GB), I presented a comparison of the query optimizers of MySQL 8.0.3 and PostgreSQL 10.1. One of the things I talked about is their ability to handle subqueries. I summarized my findings with…
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