How does one set the Type and the Degree of Participation
Douglas Wagner
hdmw at macdev.co.uk
Mon Apr 28 18:37:45 CDT 2003
Hello:
I'm using the definitions for type and degree from, "Database Design
for Mere Mortals", Hernandez. ISBN 0-201-75284-0
Here are the definitions:
Type of Participation:
Table_A's participation is mandatory if one must enter at least one
record into Table_A before one can enter records into Table_B.
Table_A's participation is optional if one is not required to enter
any records into Table_A before one can enter records into Table_B.
Degree of ParticIpation:
The degree of participation determines the minimum number of records
that a given table must have associated with a single record in the
related table and the maximum number of records that a given table is
allowed to have associated with a single record in the related table.
Can these conditions be built into a Valentina DB and if so, how?
Thanks: Douglas Wagner
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