- Sí y sí;
- Jerarquía de secciones en una base de conocimiento (una de las implementaciones);
- Sí;
La definición de una de las tablas en cuestión:
Table "knowledgebase.section"
Column | Type | Modifiers
----------------------------+--------------------------+-----------------------------------------------------------------------------
section_sid | integer | not null default nextval('knowledgebase.section_section_sid_seq'::regclass)
section | character varying | not null
description | character varying |
path | ltree | not null
is_active | boolean | not null default true
role_sid | integer | not null
last_modified_by | integer | not null
creation_datetime | timestamp with time zone | not null default now()
last_modification_datetime | timestamp with time zone | not null default now()
is_expanded | boolean | not null default false
section_idx | tsvector |
Indexes:
"section_sid_pkey" PRIMARY KEY, btree (section_sid)
"section_section_key" UNIQUE, btree (section)
"idxsection_idx" gist (section_idx)
"path_gist_idx" gist (path)
Foreign-key constraints:
"last_modified_by_fkey" FOREIGN KEY (last_modified_by) REFERENCES "user"."role"(role_sid) ON UPDATE CASCADE ON DELETE RESTRICT
"role_sid_fkey" FOREIGN KEY (role_sid) REFERENCES "user"."role"(role_sid) ON UPDATE CASCADE ON DELETE RESTRICT
Triggers:
section_idx_update BEFORE INSERT OR UPDATE ON knowledgebase.section FOR EACH ROW EXECUTE PROCEDURE tsearch2('section_idx', 'section')
La columna "ruta" utiliza la clave principal como etiqueta.
Una muestra del contenido actual de esa tabla (con respecto a la clave principal y la columna "ruta"):
section_sid | path
-------------+-------
53 | 34.53
56 | 56
55 | 29.55
35 | 35
54 | 34.54
37 | 30.37
... | ...
