Class::DBI Beginner's Guide question on Many to many entity relationship diagram
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From: Terrence Brannon
Subject: Class::DBI Beginner's Guide question on Many to many entity relationship diagram
Date: 16:28 on 21 Oct 2004
Subject: Class::DBI Beginner's Guide question on Many to many entity relationship diagram
Date: 16:28 on 21 Oct 2004
This is a multi-part message in MIME format. ------_=_NextPart_001_01C4B78B.01359E23 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I was taking a look at a Class::DBI tutorial: =20 http://class-dbi.com/cgi-bin/wiki/index.cgi?BeginnersGuide =20 and I don't understand one part of this diagram. Supposedly there is a many to many relationship between artists and groups: an artist can have many groups and a group can have many artists. But if this is the case, then=20 =20 1/ why are the crow's feet not drawn from artistgroup to band? 2/ why is a 1-to-1 relationship between artist and band shown? =20 =20 ------_=_NextPart_001_01C4B78B.01359E23 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns=3D"http://www.w3.org/TR/REC-html40">; <head> <meta http-equiv=3DContent-Type content=3D"text/html; = charset=3Dus-ascii"> <meta name=3DGenerator content=3D"Microsoft Word 11 (filtered medium)"> <style> <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman";} a:link, span.MsoHyperlink {color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-compose; font-family:Arial; color:windowtext;} @page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in;} div.Section1 {page:Section1;} --> </style> </head> <body lang=3DEN-US link=3Dblue vlink=3Dpurple> <div class=3DSection1> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>I was taking a look at a Class::DBI = tutorial:<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p> </o:p></span></font></p> <p class=3DMsoNormal style=3D'text-indent:.5in'><font size=3D2 = face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'><a href=3D"http://class-dbi.com/cgi-bin/wiki/index.cgi?BeginnersGuide">http:= //class-dbi.com/cgi-bin/wiki/index.cgi?BeginnersGuide</a><o:p></o:p></spa= n></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p> </o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'>and I don’t understand one part of this = diagram. Supposedly there is a many to many relationship between artists and = groups: an artist can have many groups and a group can have many artists. But if = this is the case, then <o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-indent:.5in'><font size=3D2 = face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo= nt></p> <p class=3DMsoNormal style=3D'text-indent:.5in'><font size=3D2 = face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>1/ why are the crow’s = feet not drawn from artistgroup to band?<o:p></o:p></span></font></p> <p class=3DMsoNormal style=3D'text-indent:.5in'><font size=3D2 = face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>2/ why is a 1-to-1 = relationship between artist and band shown?<o:p></o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p> </o:p></span></font></p> <p class=3DMsoNormal><font size=3D2 face=3DArial><span = style=3D'font-size:10.0pt; font-family:Arial'><o:p> </o:p></span></font></p> </div> </body> </html> ------_=_NextPart_001_01C4B78B.01359E23--
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Class::DBI Beginner's Guide question on Many to many entity relationship diagram
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Re: Class::DBI Beginner's Guide question on Many to many entity relationship diagram
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