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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