dia: in Chen's Notation, what are dot-bordered atts and what are multivalue atts for?
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06-11-2019 - |
سؤال
I'm looking at , and I feel like I know what's going on until I see "PlayersIn
" and "Foliage
". Foliage is a double-line-bordered attribute because it is multivalued
. What does that mean? How does it look in an actual database query? I don't know what the "PlayersIn
" dotted-line bordering indicates. Can you please explain what it indicates, and when it is useful? What does it mean, what does a query look like, why is it important, etc.?
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