
entities which are associated via the relationship. For example, the fact that there is a
relationship occurrence between warehouse W1 and product P2 can be stated by
quoting the value {W1, P2} of the composite relationship identifier {warehouseNo,
productNo}. An exception to this general rule for constructing relationship identifiers
is discussed in section 12.7, and the connection between relationship identifiers and
table row identifiers is examined in section 12.8.
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Figure 8.2 is an example of an entity-relationship occurrence diagram, that is a diagram
which shows individual entity occurrences and their relationships. ...