Is it mandatory to give a cardinality ? If cardinality is
not given what will happen?
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Answer Posted / tb
Cardinalities express the maximum number of instances of an
entity A that can be associated to corresponding instances
in another entity B.
Cardinalities need to be defined while setting up joins in
a universe. If not, we encounter join path problems such
as loops and traps, and joining tables will result in
Cartesian products.
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