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  • These are all nice hacks, but overall they are too narrow: I want a proper index which provides efficient rank-based operations. The "counting everything" is just an example; if I were to count rows in a range, manually implementing a "count everything" using triggers wouldn't help at all. Commented Jun 23, 2023 at 11:41
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    You were asking "Is it possible to augment the B-Tree indexes SQLite, MySQL / MariaDB or PostgreSQL use to include counting?" So you shouldn't complain if you get your question answered. Commented Jun 23, 2023 at 11:52
  • @LaurenzAlbe I don't see my question answered by this post, neither positively nor negatively, and my second question isn't touched upon at all. Commented Jun 23, 2023 at 16:15
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    Also SHOW TABLE STATUS and the equivalent query into information_schema.TABLES. Commented Jun 24, 2023 at 18:02