| From: | Victor Yegorov <vyegorov(at)gmail(dot)com> |
|---|---|
| To: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Unexpected update behaviour |
| Date: | 2013-12-13 22:16:51 |
| Message-ID: | CAGnEboiorcnbvNwNqV+mS1rALG9DjE_SL44bUjOCbx8Lkw_+Rw@mail.gmail.com |
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| Lists: | pgsql-general |
Greetings.
I've hit a strange issue. This is a simplified setup.
First, run create.sql to get a couple of tables.
Then, run the update query.
Tested on 9.2.6 and 9.3.2.
Now:
- if I remove the UNION ALL part of the inner query, UPDATE works;
- if I move the `raw` subquery into the CTE, UPDATE works (but takes
hours on my full data);
- if I convert this UPDATE into a SELECT, I get the row to be updated.
Could you kindly explain me why the query as it is updates no records?
--
Victor Y. Yegorov
| Attachment | Content-Type | Size |
|---|---|---|
| create.sql | application/octet-stream | 1.8 KB |
| update.sql | application/octet-stream | 836 bytes |
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