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> <channel><title>dob.sk Blog &#187; rdbms</title> <atom:link href="http://blog.dob.sk/category/devel/rdbms/feed/" rel="self" type="application/rss+xml" /><link>http://blog.dob.sk</link> <description>blog</description> <lastBuildDate>Tue, 05 Jul 2011 21:12:51 +0000</lastBuildDate> <language>en</language> <sy:updatePeriod>hourly</sy:updatePeriod> <sy:updateFrequency>1</sy:updateFrequency> <generator>http://wordpress.org/?v=3.3</generator> <xhtml:meta xmlns:xhtml="http://www.w3.org/1999/xhtml" name="robots" content="noindex" /> <item><title>Oracle VARNUM/NUMBER encoding in C</title><link>http://blog.dob.sk/2011/04/28/oracle-varnumnumber-encoding-in-c/</link> <comments>http://blog.dob.sk/2011/04/28/oracle-varnumnumber-encoding-in-c/#comments</comments> <pubDate>Thu, 28 Apr 2011 17:22:29 +0000</pubDate> <dc:creator>sam</dc:creator> <category><![CDATA[devel]]></category> <category><![CDATA[rdbms]]></category> <category><![CDATA[c]]></category> <category><![CDATA[oracle]]></category> <guid
isPermaLink="false">http://blog.dob.sk/?p=227</guid> <description><![CDATA[Just a short example C implementation of Oracle VARNUM/NUMBER type encoding, in case you could not use library functions. I didn&#8217;t found it anywhere when needed (and afterwards I found it doesn&#8217;t helps me at all due to little &#8216;problem&#8217; in ora ) and Oracle documentation is pretty unclear about how-to do it. &#160; typedef [...]]]></description> <wfw:commentRss>http://blog.dob.sk/2011/04/28/oracle-varnumnumber-encoding-in-c/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>dmlquery initial release</title><link>http://blog.dob.sk/2009/09/15/dmlquery-initial-release/</link> <comments>http://blog.dob.sk/2009/09/15/dmlquery-initial-release/#comments</comments> <pubDate>Tue, 15 Sep 2009 18:38:52 +0000</pubDate> <dc:creator>sam</dc:creator> <category><![CDATA[devel]]></category> <category><![CDATA[dmlquery]]></category> <category><![CDATA[rdbms]]></category> <guid
isPermaLink="false">http://sam.blog.dob.sk/?p=108</guid> <description><![CDATA[Just released initial release of dmlquery tool, for doing DML queries on SQL database (or anything perl DBI abstraction layer can handle) via formated XML files. Very useful for XML pipelining. With this and XML/XSLT transformations you can do very powerful thinks, like whole ETL tools for extracting data from one source (database, web&#8230;), transform [...]]]></description> <wfw:commentRss>http://blog.dob.sk/2009/09/15/dmlquery-initial-release/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Solving MAX(COUNT()) problem 2 &#8211; optimizations</title><link>http://blog.dob.sk/2009/08/19/solving-maxcount-problem-2-optimizations/</link> <comments>http://blog.dob.sk/2009/08/19/solving-maxcount-problem-2-optimizations/#comments</comments> <pubDate>Wed, 19 Aug 2009 17:49:03 +0000</pubDate> <dc:creator>sam</dc:creator> <category><![CDATA[devel]]></category> <category><![CDATA[how-to]]></category> <category><![CDATA[rdbms]]></category> <guid
isPermaLink="false">http://sam.blog.dob.sk/?p=80</guid> <description><![CDATA[In previous post I&#8217;ve tried to present my solution for solving max(count()) problem.  The solution was slightly suboptimal and I&#8217;ve needed to speed it up a bit, because I&#8217;m using it now in some statistical calculations and every millisecond is important. This is original solution. CREATE VIEW data_view_source AS SELECT DISTINCT ON (dp_id) dp_id, ds_id [...]]]></description> <wfw:commentRss>http://blog.dob.sk/2009/08/19/solving-maxcount-problem-2-optimizations/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>SQL timeline and statistical computations</title><link>http://blog.dob.sk/2009/08/07/sql-timeline-and-statistical-computations/</link> <comments>http://blog.dob.sk/2009/08/07/sql-timeline-and-statistical-computations/#comments</comments> <pubDate>Fri, 07 Aug 2009 16:32:48 +0000</pubDate> <dc:creator>sam</dc:creator> <category><![CDATA[devel]]></category> <category><![CDATA[how-to]]></category> <category><![CDATA[rdbms]]></category> <guid
isPermaLink="false">http://sam.blog.dob.sk/?p=71</guid> <description><![CDATA[This is simple way how-to generate time table (list of consequencing timestamps, or timeline) in PostgreSQL. Nothing spectacular, but might help you ,when trying to do some time based statistical selects (can feel like OLAP ). Code: CREATE OR REPLACE FUNCTION gen_time_list( tim IN TIMESTAMP, tim_stop IN TIMESTAMP, step IN INT) RETURNS TABLE(ts1 TIMESTAMP, ts2 [...]]]></description> <wfw:commentRss>http://blog.dob.sk/2009/08/07/sql-timeline-and-statistical-computations/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Solving MAX(COUNT()) problem</title><link>http://blog.dob.sk/2009/08/04/solving-maxcount-problem/</link> <comments>http://blog.dob.sk/2009/08/04/solving-maxcount-problem/#comments</comments> <pubDate>Tue, 04 Aug 2009 13:34:46 +0000</pubDate> <dc:creator>sam</dc:creator> <category><![CDATA[devel]]></category> <category><![CDATA[how-to]]></category> <category><![CDATA[rdbms]]></category> <guid
isPermaLink="false">http://sam.blog.dob.sk/?p=46</guid> <description><![CDATA[I&#8217;ve been solving problem of doing grouped MAX(COUNT()) in PostgreSQL, and because I&#8217;ve not found anything really usable out there (doing correlated sub-queries is definitely not good idea for thousands of records) I&#8217;ve had to find my own solution. Situation plan My configuration is a bit complicated to explain this, so i&#8217;ll try do it [...]]]></description> <wfw:commentRss>http://blog.dob.sk/2009/08/04/solving-maxcount-problem/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> </channel> </rss>
