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	<title>Monster Oasis &#187; union</title>
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		<title>SQL 的 union 的作法</title>
		<link>http://www.monster.com.tw/archives/1156</link>
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		<pubDate>Thu, 23 Apr 2009 13:06:25 +0000</pubDate>
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				<category><![CDATA[DATABASE]]></category>
		<category><![CDATA[JOB]]></category>
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		<category><![CDATA[union]]></category>

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		<description><![CDATA[The UNION query allows you to combine the result sets of 2 or more &#8220;select&#8221; queries. It removes duplicate rows between the various &#8220;select&#8221; statements. select count(1) from (       &#8212; 賣家       select ctrl_rowid       from bidleader.sold_record s       where s.ctrl_date like &#8217;200701%&#8217;       group by ctrl_rowid       union       &#8212; 買家       select [...]]]></description>
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