Re: [GENERAL] DROP INDEX CASCADE doesn't want to drop uniqueconstraints?

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От Andreas Kretschmer
Тема Re: [GENERAL] DROP INDEX CASCADE doesn't want to drop uniqueconstraints?
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Msg-id 20170424123814.GA20971@tux
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Ответ на [GENERAL] DROP INDEX CASCADE doesn't want to drop unique constraints?  (Ivan Voras)
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Ivan Voras <> wrote:

> Hello,
>
> On trying to drop an index named "employer_employerid_key" which supports a
> unique constraint:
>
>     "employer_employerid_key" UNIQUE CONSTRAINT, btree (employerid)
>
> I get this error:
>
> ERROR:  cannot drop index employer_employerid_key because constraint
> employer_employerid_key on table employer requires it
> HINT:  You can drop constraint employer_employerid_key on table employer
> instead.
>
> I'm using the CASCADE and IF EXISTS arguments and the docs say nothing about
> any special cases (https://www.postgresql.org/docs/9.3/static/
> sql-dropindex.html). This is with PostgreSQL 9.3.15. 
>
> The actual command is:
>
> drop index if exists employer_employerid_key cascade;
>
> Any ideas if this is normal or why it happens?


Drop the constraint:

alter table employer drop constraint employer_employerid_key;





Regards, Andreas Kretschmer
--
Andreas Kretschmer
http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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