When a property is attached to a family, is the first family record always the head-of-family? Can there be a family without a "head"?
HALinNY => -----Original Message----- => From: [EMAIL PROTECTED] => [mailto:[EMAIL PROTECTED] On Behalf Of Andy Davies => Sent: Monday, September 18, 2006 11:16 => To: profox@leafe.com => Subject: data[base] design => => => Hi, => I wonder how people would handle this design: => => family >--- property/ address [1/many to 1] family ---- => head of family [1 to 1] family ---- 2nd contact [1 to => 0/1] family ---<other members [1 to 0/many] family => ---<other stuff [1 to 0/many] => => Note: property ---< family [1 to 0/many] i.e there is => already a property table, not all properties will have a => family record (most won't) => => head of family/ 2nd contact/ other members all share similar => attributes (dob, gender, school, employer, ...) => => I have considered having one 'individuals' table which => includes flags for 'is head of family', 'is 2nd contact' etc. => which has its attractions but would seem to break => normalisation rules (a fixed 1to 1 relation split across two => tables) and might be difficult for referential integrity (a => family must have a => head) => The alternative of having 'head of family' info in the => family table and 2nd contact/ other member info in the => 'individuals' table seems messy. => => Comments please. => => Andrew Davies MBCS CITP => - AndyD 8-)# => PC Development Officer => Housing IT => Housing Services => Manchester City Council =>[EMAIL PROTECTED] Cottage => ( Office +44 161 234 5330 => ( Internal [814] 5330 => ( Mobile 0775 938 5155 (when all else fails) => * [EMAIL PROTECTED] => * home [EMAIL PROTECTED] => => => ************************************************************* => ********* => => This email and any files transmitted with it are => confidential and intended solely for the use of the => individual or entity to whom they are addressed. If you have => received this email in error please notify the system manager. => => This footnote also confirms that this email message has been => swept by MIMEsweeper for the presence of computer viruses. => => Please contact [EMAIL PROTECTED] => with any queries. => => ************************************************************* => ********* => => => [excessive quoting removed by server] _______________________________________________ Post Messages to: ProFox@leafe.com Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
