On 12/7/18 3:17 PM, Kevin Brannen wrote:
> I’m running Pg 9.6.5 if it matters…
>
> I’m trying to drop a value from an ENUM (type) and it seems like I’m
> following the fine manual yet I still get an error. For example:
>
> nms=# create type alphabet as enum ('a', 'b', 'c', 'd');
>
> CREATE TYPE
>
> nms=# alter type alphabet drop attribute if exists 'c';
>
> ERROR: 42601: syntax error at or near "'c'"
>
> LINE 1: alter type alphabet drop attribute if exists 'c';
>
> ^
>
> LOCATION: scanner_yyerror, scan.l:1086
>
> What am I doing wrong? The goal is to get rid of the ‘c’ value from the
> enum. Yes, you can assume I’ve already removed of all the ‘c’ values in
> the table where it’s used.
https://www.postgresql.org/docs/10/datatype-enum.html
"Although enum types are primarily intended for static sets of values,
there is support for adding new values to an existing enum type, and for
renaming values (see ALTER TYPE). Existing values cannot be removed from
an enum type, nor can the sort ordering of such values be changed, short
of dropping and re-creating the enum type.
>
> Or does that statement not do what I think it does and I have to do the
> “create new type, change the table to use the new type, drop old type,
> rename new type to old type” routine?
>
> Thanks,
>
> Kevin
>
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Adrian Klaver
adrian.klaver@aklaver.com