Обсуждение: how to do prefix_range default value?

hi,all
     I have installed prefix contrib,it works well.
     now I want to insert default value [] to prefix column,because if the prefix column is NULL,the returns are not I want (with prefix @>'text').I alter column prefix default [],it return error:
ERROR:  syntax error at or near "["
LINE 2:    ALTER COLUMN prefix SET DEFAULT [];

plz,how can I alter default value []?

thanks

Hi,

On Friday 03 April 2009 05:03:37 Tony Liao wrote:
>      now I want to insert default value [] to prefix column,because if the
> prefix column is NULL,the returns are not I want (with prefix @>'text').I
> alter column prefix default [],it return error:
> ERROR:  syntax error at or near "["
> LINE 2:    ALTER COLUMN prefix SET DEFAULT [];

You need to have the value protected into quotes, as it's a literal:

dim=# create table tl(a prefix_range default '[]');
CREATE TABLE
dim=# \d tl
                 Table "public.tl"
 Column |     Type     |         Modifiers
--------+--------------+----------------------------
 a      | prefix_range | default '[]'::prefix_range


--
dim

Dimitri,

        thank you.it works well.

                                                             yours,tony