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  • ¿so it could make sense to create a boolean with a check like is_true boolean NOT NULL CHECK(is_true IN(TRUE, FALSE)) right? Commented Mar 3, 2023 at 20:21
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    @CanRau indeed, to be safe against any application that tries to insert 2 or 3 or 17 into such a column or cannot handle properly such ill values. And assuming that you are on a recent enough version of MySQL that has implemented CHECK constraints (old versions do not). Commented Mar 4, 2023 at 13:21
  • Thanks for confirming 🙏 yes I'm on MySQL 8 (Planetscale) good to know about the compatibility requirement Commented Mar 4, 2023 at 14:17
  • Just wanted to add to my question if I should also mark it as boolean UNSIGNED, if that would help with anything, but then found this answer stackoverflow.com/a/74376677/3484824 so it seems better to be avoided as bool/boolean are synonyms of tinyint(1) and not tinyint(1) UNSIGNED and libraries and ORMs might depend on this Commented Mar 6, 2023 at 15:19