Or if it’s MySQL, the PK is implicitly copied into every secondary index. Adds u... | Hacker News

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		sgarland 8 months ago \| parent \| context \| favorite \| on: My takeaways from DjangoCon EU 2025 Or if it’s MySQL, the PK is implicitly copied into every secondary index. Adds up quickly.

pyuser583 8 months ago [–]

Wow did not know that. MySQL has tons of hidden behavior.

sgarland 8 months ago | [–]

So does Postgres to an extent, but in general, MySQL has more hidden edge cases, and Postgres has more hidden maintenance requirements.

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