I think you're looking for EXCEPTION:
https://www.postgresql.org/docs/14/plpgsql-control-structures.html#PLPGSQL-ERROR-TRAPPING
At the point you've trapped the error, you can then return something based
on the error. You can find a list of exception codes in one of the
appendices:
https://www.postgresql.org/docs/14/errcodes-appendix.html
On Wed, Feb 16, 2022 at 02:13:05AM +0000, Shaozhong SHI wrote:
> In Python, one can use try statement to catch error, error can be stored as
> data.
>
> Can plpgsql catch and return error as data or a data table?
>
> Regards, David
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