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	<title>select * from depesz; &#187; nullif</title>
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		<title>Tips n&#8217; tricks &#8211; rank on changes</title>
		<link>http://www.depesz.com/2010/05/13/tips-n-tricks-rank-on-changes/</link>
		<comments>http://www.depesz.com/2010/05/13/tips-n-tricks-rank-on-changes/#comments</comments>
		<pubDate>Thu, 13 May 2010 14:19:32 +0000</pubDate>
		<dc:creator>depesz</dc:creator>
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		<category><![CDATA[changes]]></category>
		<category><![CDATA[count]]></category>
		<category><![CDATA[lag]]></category>
		<category><![CDATA[nullif]]></category>
		<category><![CDATA[postgresql]]></category>
		<category><![CDATA[rank]]></category>
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		<category><![CDATA[window functions]]></category>

		<guid isPermaLink="false">http://www.depesz.com/?p=1696</guid>
		<description><![CDATA[I got asked this: having this table: # select * from a order by d; t &#124; d ---+---- O &#124; 1 O &#124; 2 O &#124; 3 M &#124; 4 M &#124; 5 M &#124; 6 M &#124; 7 O &#124; 8 O &#124; 9 O &#124; 10 I &#124; 11 I &#124; 12 [...]]]></description>
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		<title>Tips N&#8217; Tricks &#8211; count of all and just some</title>
		<link>http://www.depesz.com/2008/10/08/tips-n-tricks-count-of-all-and-just-some/</link>
		<comments>http://www.depesz.com/2008/10/08/tips-n-tricks-count-of-all-and-just-some/#comments</comments>
		<pubDate>Wed, 08 Oct 2008 18:10:17 +0000</pubDate>
		<dc:creator>depesz</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[count]]></category>
		<category><![CDATA[group by]]></category>
		<category><![CDATA[nullif]]></category>
		<category><![CDATA[postgresql]]></category>
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		<guid isPermaLink="false">http://www.depesz.com/?p=1293</guid>
		<description><![CDATA[Let&#8217;s assume you have very simple table with users: # \d users Table "public.users" Column &#124; Type &#124; Modifiers -----------+---------+---------------------------------------------------- id &#124; integer &#124; not null default nextval('users_id_seq'::regclass) username &#124; text &#124; not null is_active &#124; boolean &#124; not null default true Indexes: "users_pkey" PRIMARY KEY, btree (id) "users_username_key" UNIQUE, btree (username) And you&#8217;d like [...]]]></description>
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