I believe it is Interbase that does not support the -- comment.
> Thomas Lockhart wrote:
> >
> > I've since seen the article in the latest issue of PCWeek. The article
> > was not at all clear on the *specific* features which would disqualify
> > Postgres from having SQL92 entry level compliance (for most commercial
> > RDBMSes this is the only level they attain), and I was amused to note
> > that although InterBase was lauded for SQL92 compliance, the author
> > did encourage them to consider supporting the SQL92 comment delimiter
> > ("--") in their next release :))
>
> Why does PostgreSQL _not_ support the -- comment delimiter ?
>
> Is there something complicated to supporting it in parser ?
>
> IMNSHO it would require only a few lines in gram.y
>
> Does supporting user-defined operators interfere ?
>
> I assume we could comfortably disallow -- as a possible operator (one
> can't input it from interactive psql anyway)
>
> --------------
> Hannu
>
> ************
>
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