| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Dean Schulze <dean(dot)w(dot)schulze(at)comcast(dot)net> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #5005: unique constraint considers nulls to be equal |
| Date: | 2009-08-24 00:57:01 |
| Message-ID: | 20090824005701.GH5287@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
Dean Schulze wrote:
> Here are the duplicate records that violate this constraint:
>
> select county, year, idnumber, count(0) from table1 group by county, year,
> idnumber having (count(0) > 1) order by county, count(0);
>
>
> "county","year","idnumber","count"
> "AD",2009,"A57504",2
> "AD",2009,"A58395",2
> "AD",2009,"A58286",2
> "AD",2009,"A58299",2
> "AD",2009,"",5
What you have here seems to be an empty string, which is not the same as
a NULL value. True NULLs behave as expected.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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