var sidebar_align = 'right';
var content_container_margin = parseInt('290px');
var sidebar_width = parseInt('270px');
Implementing Supertypes-Subtypes with relations
I have read numerous texts/articles about ER modelling that involves supertype-subtype structures but none are clear in the way that these structures can be implemented in a relational database.
Some suggest it can be done, some suggest it can't but none of them give proof or examples.
Can anybody shed a bit of light on the subject?