[GENERAL] DROP INDEX CASCADE doesn't want to drop unique constraints?

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От Ivan Voras
Тема [GENERAL] DROP INDEX CASCADE doesn't want to drop unique constraints?
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Msg-id CAF-QHFXWM2aqb_Lt-qfC8ZQvd8NchdbtsnH8j23w67CjzN0Bfw@mail.gmail.com
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Ответы Re: [GENERAL] DROP INDEX CASCADE doesn't want to drop uniqueconstraints?  (Andreas Kretschmer <akretschmer@spamfence.net>)
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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?



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