Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YXw9q-00009P-Bw for pgsql-sql@arkaria.postgresql.org; Tue, 17 Mar 2015 18:24:02 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1YXw9o-0004Qn-Dm for pgsql-sql@arkaria.postgresql.org; Tue, 17 Mar 2015 18:24:00 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1YXd2x-0001rk-Hv for pgsql-sql@postgresql.org; Mon, 16 Mar 2015 21:59:39 +0000 Received: from post.visena.com ([46.226.10.50]) by makus.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1YXd2t-00070c-Hk for pgsql-sql@postgresql.org; Mon, 16 Mar 2015 21:59:37 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=visena.com; s=20141101.wh; h=Content-Type:MIME-Version:Subject:Message-ID:To:From:Date; bh=4dj5zNWNWWmSfIYrriifmeiZmnhTxEIAlJpyfxCHIeI=; b=MdRAzG04y7mKOyJop/QmLtM8v1iuk/xM18NRlMRGXMRWUo0KlEDWx3X5DLC3eiVLTDX25n1za7f0lB7k8onQOLA2OBpII2twBq94UUwJTfUFJo0XRv0kPBTaOWG930vOonA0VdvQ2sPt+wC8bIHUranyIJ6lswjZYs2wnkuylKI=; Received: from [10.0.1.10] (helo=tc7-visena.wh.internal.visena.com) by post.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1YXd2l-0007gd-Ty for pgsql-sql@postgresql.org; Mon, 16 Mar 2015 22:59:30 +0100 Received: from localhost ([127.0.0.1] helo=tc7-visena.wh.internal.visena.com) by tc7-visena.wh.internal.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1YXd2m-0003wt-IT for pgsql-sql@postgresql.org; Mon, 16 Mar 2015 22:59:28 +0100 Date: Mon, 16 Mar 2015 22:59:28 +0100 (CET) From: Andreas Joseph Krogh To: pgsql-sql@postgresql.org Message-ID: Subject: Help with effective query for listing flags in use by messages in a folder MIME-Version: 1.0 X-Mailer: Visena Mail 1.9.0-SNAPSHOT X-Spam-Score: -1.0 X-Spam-Report: SpamAssasin (score=-1.0, required 5.0 ALL_TRUSTED=-1, HTML_MESSAGE=0.001) X-Pg-Spam-Score: -0.1 (/) Content-Type: multipart/related; boundary="----=_Part_159_912792131.1426543168457" List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-sql Precedence: bulk Sender: pgsql-sql-owner@postgresql.org ------=_Part_158_1590660283.1426543168457 Content-Type: multipart/related; boundary="----=_Part_159_912792131.1426543168457" ------=_Part_159_912792131.1426543168457 Content-Type: multipart/alternative; boundary="----=_Part_160_1387082709.1426543168485" ------=_Part_160_1387082709.1426543168485 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi all. =C2=A0 On PG-9.3 (no JSONB), =C2=A0 For an IMAP-like system; I'm tr= ying to figure=20 out an effective way to query for "what flags are in use in a folder". A fl= ag=20 is considered used when one or more messages in that folder has the value= =3Dtrue.=20 =C2=A0 The schema is like this: create table message( folder_id integer not= NULL,=20 is_seenboolean NOT NULL default false, is_replied boolean not null default = false ,is_forwarded boolean not null default false, is_deleted boolean not null= =20 default false, is_draft boolean not null default false, is_flagged boolean = not=20 null default false); =C2=A0 I need the "flags" to be in the message-table f= or other=20 queries to be as efficient as possible (no JOIN'ing), the system contains= =20 millions of messages. =C2=A0 create index message_folder_id_deleted_idx ON = message( folder_id) where is_deleted =3D TRUE; create index message_folder_id_forwar= ded_idx ON message(folder_id) where is_forwarded =3D TRUE; create index=20 message_folder_id_replied_idxON message(folder_id) where is_replied =3D TRU= E;=20 create indexmessage_folder_id_seen_idx ON message(folder_id) where is_seen = =3D=20 TRUE; create index message_folder_id_flagged_idx ON message(folder_id) wher= e=20 is_flagged=3D TRUE; create index message_folder_id_draft_idx ON message(fol= der_id) whereis_draft =3D TRUE; select 'is_deleted' from (select * from message whe= re=20 folder_id=3D 3 AND is_deleted limit 1) as q UNION select 'is_forwarded' fro= m ( select* from message where folder_id =3D 3 AND is_forwarded limit 1) as q U= NION=20 select'isreplied' from (select * from message where folder_id =3D 3 AND is_= replied limit1) as q UNION select 'is_seen' from (select * from message where folde= r_id=20 =3D3 AND is_seen limit 1) as q UNION select 'is_flagged' from (select * fro= m=20 message wherefolder_id =3D 3 AND is_flagged limit 1) as q UNION select 'is_= draft'=20 from(select * from message where folder_id =3D 3 AND is_draft limit 1) as q= ; =C2=A0=20 Are there better ways to do this? =C2=A0 Thanks. =C2=A0 -- Andreas Joseph K= rogh CTO /=20 Partner - Visena AS Mobile: +47 909 56 963 andreas@visena.com=20 www.visena.com =20 ------=_Part_160_1387082709.1426543168485 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi all.
=C2=A0
On PG-9.3 (no JSONB),
=C2=A0
For an IMAP-like system; I'm trying to figure out an effective way to = query for "what flags are in use in a folder". A flag is consider= ed used when one or more messages in that folder has the value=3Dtrue.
=C2=A0
The schema is like this:
create table message(
    folder_id =
integer no=
t NULL,
    is_seen boolean NOT =
NULL default false,
    is_replied=
 boolean n=
ot null default false,
    is_forward=
ed boolean=
 not null default false,
    is_deleted=
 boolean n=
ot null default false,
    is_draft <=
/span>boolean not=
 null default false,
    is_flagged=
 boolean n=
ot null default false
);
=C2=A0
I need the "flags" to be in the message-table for other quer= ies to be as efficient as possible (no JOIN'ing), the system contains milli= ons of messages.
=C2=A0
create index message_folder_id_deleted_idx ON message(folder_id) where is_deleted =3D <=
span style=3D"color: rgb(0, 0, 128); font-weight: bold;">TRUE;
create index message_folder_id_forwarded_idx ON message(folder_id) where is_forwarded =3D TRUE;
create index message_folder_id_replied_idx ON message(folder_id) where is_replied =3D TRUE;
create index message_folder_id_seen_idx ON message(folder_id) where is_seen =3D TRUE;
create index message_folder_id_flagged_idx ON message(folder_id) where is_flagged =3D TRUE;
create index message_folder_id_draft_idx ON message(folder_id) where is_draft =3D TRUE;

select 'is_deleted' =
from (select * from message where folder_id =
=3D 3 AND is_deleted limit 1) as q
UNION
select 'is_forwarded=
' from (select * from message =
where f=
older_id =3D 3 AND is_forwarded limit 1) as q
UNION
select 'isreplied' <=
/span>from (select *=
 from message whe=
re fold=
er_id =3D 3 AND is_replied limit 1) as q
UNION
select 'is_seen' from (=
select * <=
span style=3D"color: rgb(0, 0, 128); font-weight: bold;">from message where=
 folder=
_id =3D 3 AND is_seen limit 1) as q
UNION
select 'is_flagged' =
from (select =
* from message wh=
ere fol=
der_id =3D 3 AND is_flagged limit 1) as q
UNION
select 'is_draft' <=
/span>from (select * from =
message where =
folder_id =3D 3 AND is_draft limit 1) as q
;
=C2=A0
Are there better ways to do this?
=C2=A0
Thanks.
=C2=A0
--
Andrea= s Joseph Krogh
CTO / Partner<= /span> - Visena AS
Mobile: +47 90= 9 56 963
=3D""
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