Andrew Dunstan <and...@dunslane.net> writes:
> When did the SQL standard add any mention of ?

It's in SQL92.  I don't have a copy of SQL89, or whatever the previous
spec was, to look at.

(So you could argue that Yu and Chen should've removed ? from the set of
allowed operator characters when they grafted SQL syntax onto Postgres.
But they didn't ...)

                        regards, tom lane


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