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	<title>web-dev.lv &#187; union</title>
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		<title>SQL Rokasgrāmata 3. daļa [UNION]</title>
		<link>http://web-dev.lv/2009/04/sql-rokasgramata-3-dala-union/</link>
		<comments>http://web-dev.lv/2009/04/sql-rokasgramata-3-dala-union/#comments</comments>
		<pubDate>Wed, 08 Apr 2009 08:44:22 +0000</pubDate>
		<dc:creator>Roberts Mozgis</dc:creator>
				<category><![CDATA[Datubāzes]]></category>
		<category><![CDATA[sql]]></category>
		<category><![CDATA[uninon select]]></category>
		<category><![CDATA[union]]></category>

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		<description><![CDATA[Izmantojot SQL UNION iespējams izpildīt divus vai vairākus SQL pieprasījumus vienlaicīgi
SQL UNION
Lai UNION izpildītos korekti bieži nepieciešams lai peprasīto lauku skaits būtu vienāds
SQL UNION Sintakse

SELECT column_name&#40;s&#41; FROM table_name1
UNION
SELECT column_name&#40;s&#41; FROM table_name2


Piebilde: Pēc noklusējuma UNION atlasa tikai unikālos ierakstus, lai atlasītu visus ierakstus jāizmanto UNION ALL
UNION ALL Sintakse

SELECT column_name&#40;s&#41; FROM table_name1
UNION ALL
SELECT column_name&#40;s&#41; FROM table_name2

SQL UNION Izmantošanas piemērs
Divas datubāzes tabulas:
&#8220;Employees_Norway&#8221;:



E_ID
E_Name


01
Hansen, Ola


02
Svendson, ...<br /><div><img src="http://web-dev.lv/wp-content/plugins/gd-star-rating/gfx.php?value=5.0" /></div><div>Rating: 5.0/<strong>5</strong> (1 vote cast)</div><br />]]></description>
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