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What does the cardinality ratio specify?
Mapping cardinalities or cardinality ratios state the number of entities to which another entity can be associated. Mapping cardinalities must be one of the following:
One to one
One to many
Many to one
Many to many
what is natural join?
example of embedded SQL query
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how many hourse have been spent on a certain project
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The Maximum no of key fields that can be used in a header is?? 50
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