PG Doc comments form <nore...@postgresql.org> writes: > Page: https://www.postgresql.org/docs/15/functions-string.html > Documentation > split_part ( string text, delimiter text, n integer ) → text > Splits string at occurrences of delimiter and returns the n'th field > (counting from one), or when n is negative, returns the |n|'th-from-last > field. > split_part('abc~@~def~@~ghi', '~@~', 2) → def > split_part('abc,def,ghi,jkl', ',', -2) → ghi
> Observation > SELECT split_part('abc,def,ghi,jkl', ',', -1); > generates > ERROR: field position must be greater than zero > SQL state: 22023 Apparently, you are reading the v15 documentation and expecting it to be exactly correct for some older server version. The described behavior came in in v14. regards, tom lane