https://wiki.iaoa.org/index.php?action=history&feed=atom&title=Edu_talk%3ARelation 2026-04-27T12:14:49Z Revision history for this page on the wiki MediaWiki 1.31.0 https://wiki.iaoa.org/index.php?title=Edu_talk:Relation&diff=699&oldid=prev 2020-01-20T18:40:34Z

<p>Moved first three entries to main &#039;Relation&#039; page.</p> <table class="diff diff-contentalign-left" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #222; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 18:40, 20 January 2020</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">* [[Edu:Predicate|Predicate]] is also used in relation to ''relation'', but that covers either sense as well, and it can be unary (which a relation cannot be).</del></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&#160;</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">* ''Relation'' has a specific meaning in relational database theory, it being a set of tuples (d1, d2, ..., dn) where each dj (with 1 &lt;= j &lt;= n) is a member of data domain Dj. (reference: any database text book)</del></div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* The definitions above are my own (M Keet), as the sources consulted either had a formal definition alike in the database context, or informal <ins class="diffchange diffchange-inline">hand waiving </ins>descriptions on having to do with 'between', rather than a neat definition that could be copied.</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">* If one takes the mathematics definition of ''relation'', then also functions and attributes are relations.</del></div></td><td colspan="2">&#160;</td></tr> <tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* The definitions above are my own (M Keet), as the sources consulted either had a formal definition alike in the database context, or informal <del class="diffchange diffchange-inline">handwaiving </del>descriptions on having to do with 'between', rather than a neat definition that could be copied.</div></td><td colspan="2">&#160;</td></tr> </table>

Tsch https://wiki.iaoa.org/index.php?title=Edu_talk:Relation&diff=156&oldid=prev 2019-11-11T03:15:31Z

<p>Created page with &quot;* <a href="/index.php/Edu:Predicate" title="Edu:Predicate">Predicate</a> is also used in relation to &#039;&#039;relation&#039;&#039;, but that covers either sense as well, and it can be unary (which a relation cannot be). * &#039;&#039;Relation&#039;&#039;...&quot;</p> <p><b>New page</b></p><div>* [[Edu:Predicate|Predicate]] is also used in relation to ''relation'', but that covers either sense as well, and it can be unary (which a relation cannot be).<br /> * ''Relation'' has a specific meaning in relational database theory, it being a set of tuples (d1, d2, ..., dn) where each dj (with 1 &lt;= j &lt;= n) is a member of data domain Dj. (reference: any database text book)<br /> * If one takes the mathematics definition of ''relation'', then also functions and attributes are relations.<br /> * The definitions above are my own (M Keet), as the sources consulted either had a formal definition alike in the database context, or informal handwaiving descriptions on having to do with 'between', rather than a neat definition that could be copied.</div>

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