> From: Patrick Cassidy (01)
> In the RDB's I have seen, each field (column in a table) often
(typically?)
> represents one relation on the type represented by the table, so the
number
> of columns does not have any relation to the arity of the relations
used.
> Two or more columns can be used together to represent higher-arity
> relations, but they may be quite independent. (02)
I'm not certain I know what you mean. In an entity-relationship isn't
the relation the entire row, not just one column? The entity is the name
of the table. The names of the columns are the identifiers of an n-ary
relation. Each row is an instance of the n-ary relation. Or am I missing
something? (03)
-- Jeff Schiffel (04)
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