Re: BUG #14121: Constraint UNIQUE

On Fri, Apr 29, 2016 at 5:35 AM, <m(dot)giraldo(at)stt-telefonia(dot)it> wrote:

> The following bug has been logged on the website:
>
> Bug reference: 14121
> Logged by: Marco
> Email address: m(dot)giraldo(at)stt-telefonia(dot)it
> PostgreSQL version: 9.5.0
> Operating system: Windows 7
> Description:
>
> Hi
> I have a problem with UNIQUE constraint.
> I don't understand the difference from TYPE type UNIQUE(when I declare a
> column of the table) and ALTER TABLE table ADD CONSTRAINT column UNIQUE
> (column).
> How can I remove the UNIQUE option from TYPE declaration?
>
> Best reguards
>

​ALTER TABLE table DROP CONSTRAINT constraint_name;

Example:

# create table c(c text unique);

CREATE TABLE

# \d+ c
Table "public.c"

Column | Type | Modifiers | Storage | Stats target | Description

--------+------+-----------+----------+--------------+-------------

c | text | | extended | |

Indexes:

"c_c_key" UNIQUE CONSTRAINT, btree (c)

# alter table c drop constraint c_c_key;
ALTER TABLE
# \d+ c
Table "public.c"
Column | Type | Modifiers | Storage | Stats target | Description
--------+------+-----------+----------+--------------+-------------
c | text | | extended | |
​

--
The unfacts, did we have them, are too imprecisely few to warrant our
certitude.

Maranatha! <><
John McKown