Simple ER problem cant figure out how to model
From: chris <xnuus_at_hotmail.com>
Date: 11 Apr 2003 16:54:44 -0700
Message-ID: <b04c1374.0304111554.3f078e1f_at_posting.google.com>
Hi
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Dec= $102
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Dec= $152
Date: 11 Apr 2003 16:54:44 -0700
Message-ID: <b04c1374.0304111554.3f078e1f_at_posting.google.com>
Hi
Okay here's one, I'm try to create an ER model for a hotel system, I have 3 types of room 'single' 'double' 'twin' with two price bands 'A' and 'B'. single uses price band 'A' double and twin uses band 'B'. the prices change every month so for example:
price band A
Jan= $100 per/night Feb= $101 Mar= $105 Apr= $108
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.
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Dec= $102
price band B
Jan= $150 Feb= $151 Mar= $155 Apr= $158
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.
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Dec= $152
Now I just can see what is an entity and what is an attribute, any ideas of how to think of this ? Obviously room is an entity, its the price Im having difficulty with, is price band an attribute of entity room for instance ?
CP Received on Sat Apr 12 2003 - 01:54:44 CEST