On Sat, Aug 31, 2019 at 7:05 AM stan <st...@panix.com> wrote:

>
> CURRENT_DATE) - interval '  $1
>                                                                 month - 1
> ' day as date)
>

($1 || ' month')::interval  -- should work

Content within a literal (i.e., between single quotes) is always treated as
literal content.

David J.

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