Why does this SQL work? - Mailing list pgsql-general
| From | Anil Menon |
|---|---|
| Subject | Why does this SQL work? |
| Date | |
| Msg-id | CAHzbRKc-zdxa-wtdq+ZQSRBeRkQH6f8HzBQ2WwBq0fK+79n2iw@mail.gmail.com Whole thread Raw |
| Responses |
Re: Why does this SQL work?
(hubert depesz lubaczewski <depesz@depesz.com>)
Re: Why does this SQL work? (Victor Yegorov <vyegorov@gmail.com>) |
| List | pgsql-general |
Hi,
I have the following setup :
manualscan=> set search_path=ver736,public;
SET
manualscan=> \d courier;
Table "ver736.courier"
Column | Type | Modifiers
---------------+------------------------+----------------------------------------------------------
org_id | smallint | not null default nextval('courier_org_id_seq'::regclass)
courier_name | character varying(500) | not null
courier_code | character varying(50) |
is_valid | boolean |
universe_id | character varying(50) |
courier_image | bytea |
Indexes:
"courier_pk" PRIMARY KEY, btree (org_id)
"courier_code_un" UNIQUE CONSTRAINT, btree (courier_code)
"courier_name_un" UNIQUE CONSTRAINT, btree (courier_name)
"courier_code_idx" btree (courier_code)
Referenced by:
xxx...xxx...(a few tables)
manualscan=> \d msgtxt;
Table "public.msgtxt"
Column | Type | Modifiers
-------------------+--------------------------+--------------------------------------------------------
msgid | integer | not null default nextval('msgtxt_msgid_seq'::regclass)
msgval | text |
transaction_stamp | timestamp with time zone | default now()
corelationid | text |
deviverymode | integer |
destination | text |
expiration | integer |
messageid | text |
priority | integer |
redelivered | boolean |
replyto | text |
timestamp | bigint |
msgtype | text |
senderid | text |
Indexes:
"msgtxt_pkey" PRIMARY KEY, btree (msgid)
Triggers:
manual_scan_tx_tr AFTER INSERT ON msgtxt FOR EACH ROW EXECUTE PROCEDURE process_manual_scan_tx()
manualscan=> select count(*) From msgtxt where msgid in (
manualscan(> select msgid From courier where org_id=3
manualscan(> )
manualscan-> ;
count
-------
10225
(1 row)
manualscan=> select count(*) From public.msgtxt where msgid in (select msgid From ver736.courier where org_id=3);
count
-------
10225
(1 row)
Please note, there is no msgid col in courier table. Which brings the question why does this SQL work? An "select msgid From courier where org_id=3" by itself gives error column "msgid" does not exist.
OS Version : Centos 7
PG Version : PostgreSQL 9.4.1 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.8.2 20140120 (Red Hat 4.8.2-16), 64-bit
Regards
AK
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