> On 06/07/2023 11:19 CEST gzh <gzhcoder@126.com> 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