Schema DDL Linking record types
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Example 2
The MANUAL option is used if, for example, a record type is a member type of two sets and
some of its member records are to belong to one set occurrence only.
Figure 19: Example of membership in two parallel sets
This example illustrates how project heads can be selected from all employees working on
a project by using a set. As not all employees working on a project can be proje ct heads,
this set must be defined as MANUAL. An employee is taken over into the corresponding set
occurrence only when he or she becomes head of a project. If the set is defined as
OPTIONAL, the employee can be deleted from the set once no longer head of the project.
EMPLOYEE
PROJECT
HEAD
(OPTIONAL MANUAL)
EMPLOYEES