| From: | "Thomas G(dot) Lockhart" <lockhart(at)alumni(dot)caltech(dot)edu> |
|---|---|
| To: | Valerio Santinelli <tanis(at)mediacom(dot)it> |
| Cc: | "jose' soares" <sferac(at)bo(dot)nettuno(dot)it>, "'pgsql-interfaces(at)postgreSQL(dot)org'" <pgsql-interfaces(at)postgreSQL(dot)org>, Michael Davis <michael(dot)davis(at)prevuenet(dot)com> |
| Subject: | Re: [INTERFACES] Foreign Keys |
| Date: | 1999-03-04 13:54:09 |
| Message-ID: | 36DE9081.529561FC@alumni.caltech.edu |
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| Thread: | |
| Lists: | pgsql-interfaces |
> Thanks. That was what i was looking for. It's been real useful!
> I also put this other line to handle the inverse case (NULL = field)
>
> | NULL_P '=' a_expr
> { $$ = makeA_Expr(ISNULL, NULL, $3, NULL); }
This leads to a shift/reduce conflict in yacc. I've been working on this
a bit, and have modified gram.y (so far just in my local copy) to allow
Jose's syntax and to allow the same syntax in a constraint declaration.
But this variant may be tougher to do correctly...
- Tom
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