| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Joey Caughey <jcaughey(at)parrotmarketing(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, gkimball(at)parrotmarketing(dot)com |
| Subject: | Re: JSON and Postgres Variable Queries |
| Date: | 2014-06-23 16:16:59 |
| Message-ID: | 16964.1403540219@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> You might find a sub-SELECT helpful:
> SELECT * FROM (SELECT json_data->>plan'->>id' as plan_id FROM
> orders) x WHERE plan_id = 1
> It might be a generally useful thing for WHERE-clause items to be able
> to reference items from the target list by alias, or maybe it's
> problematic for some reason that I don't know about,
Standards compliance? It's not just a trivial syntactic issue either,
but a rather fundamental conceptual one: expressions in the target list
are not supposed to be evaluated until after the WHERE clause is.
regards, tom lane
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