Re: [GENERAL] multiple column to onec column

[zab08]

thanks , this is a example of my application.


the ans is here, http://www.postgresql.org/docs/9.0/static/xaggr.html


sql command:


CREATE AGGREGATE array_accum (anyelement)
(
    sfunc = array_append,
    stype = anyarray,
    initcond = '{}'
);

 

SELECT r.role_name, array_accum(permission) from roles r, roles_permissions rp 
group by r.role_name;




and the result:

role_name |              array_accum              

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

 role2     | {permission1,permission2,permission1}

 role1     | {permission1,permission2,permission1}