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Date: Sun, 4 May 2014 18:53:57 +0200 (CEST)
From: Andreas Joseph Krogh <andreas@visena.com>
To: =?UTF-8?Q?Brice_Andr=C3=A9?= <brice@famille-andre.be>
Cc: pgsql-sql <pgsql-sql@postgresql.org>
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In-Reply-To: 
 <CAOBG12m_KDpJRkgfRSUis_9F082+Zk4vjeXnoRg=w5QGY5Dx9g@mail.gmail.com>
Subject: Re: Optimize query for listing un-read messages
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P=C3=A5 s=C3=B8ndag 04. mai 2014 kl. 18:49:43, skrev Brice Andr=C3=A9 <bric=
e@famille-andre.be=20
<mailto:brice@famille-andre.be>>: Yes, I was a bit too fast. but replace it=
 with
 =C2=A0 WHERE NOT prop.is_read =3D TRUE
 =C2=A0 and it should be OK. =C2=A0 No, that also will be treated as an INN=
ER JOIN,=20
because it kills tuples where prop is null. I need entries where prop IS NU=
LL=20
(hence the LEFT OUTER JOIN) because messages without an entry in=20
message_property must be treated as unread, the same as messages with an en=
try=20
in message_property where is_read=3DFALSE. =C2=A0 -- Andreas Jospeh Krogh C=
TO / Partner
 - Visena AS Mobile: +47 909 56 963 andreas@visena.com=20
<mailto:andreas@visena.com> www.visena.com <https://www.visena.com> =20
<https://www.visena.com> =C2=A0
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<div>P=C3=A5 s=C3=B8ndag 04. mai 2014 kl. 18:49:43, skrev Brice Andr=C3=A9 =
&lt;<a href=3D"mailto:brice@famille-andre.be" target=3D"_blank">brice@famil=
le-andre.be</a>&gt;:</div>

<blockquote style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt=
 0pt 0pt 0.8ex; padding-left: 1ex;">
<div dir=3D"ltr">
<div>
<div>Yes, I was a bit too fast. but replace it with<br>
=C2=A0</div>
WHERE NOT prop.is_read =3D TRUE<br>
=C2=A0</div>
and it should be OK.</div>
</blockquote>

<div>=C2=A0</div>

<div>No, that also will be treated as an INNER JOIN, because it kills tuple=
s where prop is null. I need entries where prop IS NULL (hence the LEFT OUT=
ER JOIN) because messages without an entry in message_property must be trea=
ted as unread, the same as messages with an entry in message_property where=
 is_read=3DFALSE.</div>

<div>=C2=A0</div>

<div class=3D"origo-email-signature">
<div>--
<div><span style=3D"font-family:arial,helvetica,sans-serif;"><strong>Andrea=
s Jospeh Krogh</strong></span></div>

<div><span style=3D"font-family:arial,helvetica,sans-serif;">CTO / Partner<=
/span> - Visena AS</div>

<div><span style=3D"font-family:arial,helvetica,sans-serif;">Mobile: +47 90=
9 56 963</span></div>

<div><a href=3D"mailto:andreas@visena.com" target=3D"_blank">andreas@visena=
.com</a></div>

<div><a href=3D"https://www.visena.com" target=3D"_blank">www.visena.com</a=
></div>

<div style=3D"padding-top: 5px"><a href=3D"https://www.visena.com" target=
=3D"_blank"><img alt=3D"" src=3D"cid:part_F6156022736431I30QO"></a></div>
</div>
</div>

<div>=C2=A0</div>
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