I know that. But as the OP wasn't very clear, I extrapolated a little. > SQLite does not have an ARRAY type Well, there's [JSON1][1], `json_each()` and `json_group_array` allow to *take-apart* and *reconstitute* JSON arrays, so that close :). The Sudoku solver also uses the string as an array of sort too. So you're of course right that SQLite doesn't have arrays per-se, but *packing* several values in strings is a common work-around. That likely complicates calculating a shortest-path in SQL, but it is still probably possible. [1]: https://www.sqlite.org/json1.html