| Mapping Summary |
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| Ÿ | Just showed nine
valid ways a 1-1 |
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| relationship
could be represented in a |
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| database |
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| – | Most persistence
layers and application servers |
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| will only support
one |
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| Ÿ | Without good
support, designs will be forced |
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| Ÿ | Imagine the
flexibility needed for other |
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| mappings like 1-M
and M-M |
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