Is ALSO part of the SQL standard? I can't imagine it is because there
is no rule mention.
I guess if were were coding from scratch, we could make the syntax
INSTEAD or ALSO, but at this point, I don't see adding ALSO as a useful
change.
---------------------------------------------------------------------------
Fabien COELHO wrote:
>
> Dear patchers,
>
> Please find attached a small patch to add an optionnal "ALSO" keyword
> to the "CREATE RULE" syntax.
>
> The "ALSO" keyword can be used where "INSTEAD" would be used,
> to mean the opposite, i.e. the current default behavior of rules
> which adds operations to the current one. IMHO, it makes the
> intended behavior much clearer for the basic user (say, me;-).
>
> CREATE RULE some_table_del AS
> ON DELETE TO some_table DO ALSO
> (
> DELETE FROM this_other_table WHERE id=old.id;
> );
>
> Of course, the absence of the "ALSO" keyword preserves the previous
> behavior... that is it behaves the same as with the "ALSO" keyword.
>
> This patch was made against 7.4.1 with the "difforig" script
> provided by postgresql.
>
> It adds "ALSO" keyword in the parser code (two lines), fixes somehow the
> documentation and sql help, and modifies four of the "RULE"
> test cases to use this keyword instead of the default nothing-ness.
>
> It validated for me with a "make check".
>
> Have a nice day,
>
> --
> Fabien Coelho - coelho@cri.ensmp.fr
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