Re: [pgsql-ru-general] Помогите написать выборку.

Приветствую Пётр,

19 мая 2011 г. 18:30 пользователь Peter Teslenko
<smartchecker(at)gmail(dot)com>написал:

> Приветствую.
>
> Есть несколько таблиц. Мне нужно написать выборку чтобы вместо
> request_type_id и прочих _id подставлялись
> текстовые значения из соотв. таблиц. Один JOIN я ещё написать могу, а с
> остальными теряюсь.
>
> drupal6=# \d journal_of_requests
> Table "public.journal_of_requests"
> Column | Type |
> Modifiers
>
> -------------------+-----------------------------+-------------------------------------------------------------------
> rid | integer | not null default
> nextval('journal_of_requests_rid_seq'::regclass)
> request_date | timestamp without time zone | not null default now()
> request_type_id | integer | default 0
> request_object_id | integer | default 0
> request_org | character varying(255) | default ''::character
> varying
> request_person | character varying(255) | default ''::character
> varying
> request_phone | character varying(255) | default ''::character
> varying
> request_point | character varying(255) | default ''::character
> varying
> request_state_id | integer | default 0
> request_comment | character varying(255) | default ''::character
> varying
> request_executive | character varying(255) |
> Indexes:
> "journal_of_requests_pkey" PRIMARY KEY, btree (rid)
> "journal_of_requests_rid_idx" btree (rid)
> Check constraints:
> "journal_of_requests_request_object_id_check" CHECK (request_object_id
> >= 0)
> "journal_of_requests_request_state_id_check" CHECK (request_state_id >=
> 0)
> "journal_of_requests_request_type_id_check" CHECK (request_type_id >= 0)
> "journal_of_requests_rid_check" CHECK (rid >= 0)
>
>
> drupal6=# \d request_object
> Table "public.request_object"
> Column | Type | Modifiers
>
> ----------+------------------------+--------------------------------------------------------------
> oid | integer | not null default
> nextval('request_object_oid_seq'::regclass)
> obj_name | character varying(255) | not null
> Indexes:
> "request_object_pkey" PRIMARY KEY, btree (oid)
> "request_object_oid_idx" btree (oid)
> Check constraints:
> "request_object_oid_check" CHECK (oid >= 0)
>
>
> drupal6=# \d request_state
> Table "public.request_state"
> Column | Type | Modifiers
>
> ------------+------------------------+-------------------------------------------------------------
> sid | integer | not null default
> nextval('request_state_sid_seq'::regclass)
> state_name | character varying(255) | not null
> Indexes:
> "request_state_pkey" PRIMARY KEY, btree (sid)
> "request_state_sid_idx" btree (sid)
> Check constraints:
> "request_state_sid_check" CHECK (sid >= 0)
>
>
> drupal6=# \d request_type
> Table "public.request_type"
> Column | Type | Modifiers
>
> --------+------------------------+-------------------------------------------------------------
> rtid | integer | not null default
> nextval('request_type_rtid_seq'::regclass)
> type | character varying(255) | not null
> Indexes:
> "request_type_pkey" PRIMARY KEY, btree (rtid)
> "request_type_rtid_idx" btree (rtid)
> Check constraints:
> "request_type_rtid_check" CHECK (rtid >= 0)
>
SELECT request_type.type, request_state.state_name, request_object.obj_name
FROM journal_of_requests
JOIN request_type ON request_type_id = rtid
JOIN request_object ON request_object_id = oid
JOIN request_state ON request_state_id = sid;

>
>
>
> --
> Peter Teslenko
> Jabber: peter(at)jabber(dot)mcicb(dot)ru
>
> --
> Sent via pgsql-ru-general mailing list (pgsql-ru-general(at)postgresql(dot)org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-ru-general
>

--
// Dmitriy.