Date: Wed, 17 Jun 2020 00:10:37 +0200 (CEST)
From: Andreas Joseph Krogh <andreas@visena.com>
To: pgsql-performance@lists.postgresql.org
Message-ID: <VisenaEmail.75.e9daa0e3fd342c43.172bf2e861a@tc7-visena>
In-Reply-To: <20200616220526.GK20404@telsasoft.com>
References: <574079062.1873527.1592339731136.ref@mail.yahoo.com>
 <574079062.1873527.1592339731136@mail.yahoo.com>
 <20200616220526.GK20404@telsasoft.com>
Subject: Re: simple query running for ever
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P=C3=A5 onsdag 17. juni 2020 kl. 00:05:26, skrev Justin Pryzby <pryzby@tels=
asoft.com
 <mailto:pryzby@telsasoft.com>>:=20
On Tue, Jun 16, 2020 at 08:35:31PM +0000, Nagaraj Raj wrote:
 > I wrote a simple query, and it is taking too long, not sure what is wron=
g=20
in it, even its not giving EXPLAIN ANALYZE.
 >
 > select T0."physical_address_sid", T0."individual_entity_proxy_id",=20
T2."infrrd_hh_rank_nbr"
 > from "cms_prospects".PROSPECT T0
 > --inner join "sas_prs_tmp".DEDUPE3583E3F18 T1 on=20
T0."individual_entity_proxy_id" =3D T1."individual_entity_proxy_id"
 > left join "cms_prospects".INDIVIDUAL_DEMOGRAPHIC T2 on=20
T0."individual_entity_proxy_id" =3D T2."individual_entity_proxy_id"

 Pardon me for saying so, but this query seems silly.

 It's self-joining a table on its PK, which I don't think could ever be use=
ful.

Where is the self-join?=20


--
 Andreas Joseph Krogh=20
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<div>P=C3=A5 onsdag 17. juni 2020 kl. 00:05:26, skrev Justin Pryzby &lt;<a =
href=3D"mailto:pryzby@telsasoft.com">pryzby@telsasoft.com</a>&gt;:</div>

<blockquote style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt=
 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style=3D"display:inline; font-family: monospace; font-size: 12px;">On =
Tue, Jun 16, 2020 at 08:35:31PM +0000, Nagaraj Raj wrote:<br>
&gt; I wrote a simple query, and it is taking too long, not sure what is wr=
ong in it, even its not giving EXPLAIN ANALYZE.<br>
&gt;<br>
&gt; select T0.&quot;physical_address_sid&quot;, T0.&quot;individual_entity=
_proxy_id&quot;, T2.&quot;infrrd_hh_rank_nbr&quot;<br>
&gt; from &quot;cms_prospects&quot;.PROSPECT T0<br>
&gt; --inner join &quot;sas_prs_tmp&quot;.DEDUPE3583E3F18 T1 on T0.&quot;in=
dividual_entity_proxy_id&quot; =3D T1.&quot;individual_entity_proxy_id&quot=
;<br>
&gt; left join &quot;cms_prospects&quot;.INDIVIDUAL_DEMOGRAPHIC T2 on T0.&q=
uot;individual_entity_proxy_id&quot; =3D T2.&quot;individual_entity_proxy_i=
d&quot;<br>
<br>
Pardon me for saying so, but this query seems silly.<br>
<br>
It's self-joining a table on its PK, which I don't think could ever be usef=
ul.</div>
</blockquote>

<div>=C2=A0</div>

<div>Where is the self-join?</div>

<div>=C2=A0</div>

<div class=3D"visena-email-signature" data-visena-message-id=3D"&lt;VisenaE=
mail.75.e9daa0e3fd342c43.172bf2e861a@tc7-visena>">
<div>--<br>
Andreas Joseph Krogh</div>
</div>
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