Join is defined on Wikipedia


	Join is defined on Wikipedia

Osolage

4-10-2007 4:42 PM

382 views

tags:

database, sql

Osolage says:

I had no idea that, but it is really cool that somebody did that. I'll have to read up on it later.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/35a0d149-1f9f-4c97-b516-34862ee50b65/AE14780E-FDEF-4B33-913F-24DFF7465929/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://en.wikipedia.org/w/index.php?title=Join_%28SQL%29&oldid=121612644" href="http://en.wikipedia.org/w/index.php?title=Join_%28SQL%29&oldid=121612644" style="font-size: 11px;">en.wikipedia.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Join_%28SQL%29&oldid=121612644"><P>A <B>join</B> combines records from two <A title="Table (database)" href="http://en.wikipedia.org/wiki/Table_%28database%29">tables</A> in a <A title="Relational database" href="http://en.wikipedia.org/wiki/Relational_database">relational database</A> and results in a new (temporary) table, also called <I>joined table</I>. In the Structured Query Language (<A title="SQL" href="http://en.wikipedia.org/wiki/SQL">SQL</A>), there are two types of joins: inner and outer.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Join_%28SQL%29&oldid=121612644"><P>As a special case, a table (base table, view, or joined table) can be joined with itself again. This is called <B>self-join</B>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Join_%28SQL%29&oldid=121612644"><P>Mathematically, join is <A title="Relation composition" href="http://en.wikipedia.org/wiki/Relation_composition">relation composition</A>, the fundamental operation in <A title="Relational algebra" href="http://en.wikipedia.org/wiki/Relational_algebra">relational algebra</A>, and generalizing <A title="Function composition" href="http://en.wikipedia.org/wiki/Function_composition">function composition</A>.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/AE14780E-FDEF-4B33-913F-24DFF7465929/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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