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Rule 6
In this step all relationships of order n are transformed into the relational database scheme. This happens according to rule 5.
Definition rule 6
For all n-ary relationship types (n>2) use rule 5: Create a new relational scheme R and use the primary keys of all connected relational schemes (S, T, etc.) as foreign keys. Together they form the primary key for this new relational scheme R.
See the example of rule 5.
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