Thank you very much for taking the time to reply to my question.
I added oracle to search_path, but it didn't work.
postgres=# show search_path;
search_path
-------------------------------------
"$user", public, oracle, pg_catalog
At 2023-07-06 19:36:49, "Erik Wienhold" <ewie@xxxxxxxxx> wrote: >> On 06/07/2023 11:19 CEST gzh <gzhcoder@xxxxxxx> wrote: >> >> I upgraded the version of PostgreSQL from 12.6 to 12.13, >> when I execute the sql below , the to_char function caused the following error. >> >> ---------------SQL------------------ >> select TO_CHAR('1000000'); >> >> ERROR: function to_char(unknown) is not unique at character 8 >> HINT: Could not choose a best candidate function. You might need to add explicit type casts. >> >> There is no problem before the upgrade and to_char function comes from the >> Orafce extension. >> The configuration of the old and new databases is as follows. >> >> Database server (old): PostgreSQL 12.6（orafce3.13） >> Database server (new): PostgreSQL 12.13（orafce3.24） >> >> The new database has successfully installed the orafce 3.24 extension. >> It does not occur in "PostgreSQL 12.6 and orafce 3.13", >> but occurs in "PostgreSQL 12.13 and orafce 3.24", >> so either the difference between 12.6 and 12.13 or the difference between >> orafce 3.13 and 3.24 is suspicious. >> >> What is the reason for the problem and how to fix the error? > >This rings a bell: > >https://www.postgresql.org/message-id/1597875806.606392.1681915893771%40office.mailbox.org > >Either qualify functions with namespace oracle, e.g. oracle.to_char('1000000'), >or place oracle on the search path. > >-- >Erik
