1-1-1 ternary relationship (one-to-one-to-one
ternary relationship)
The above ER
diagram has cardinality ratio 1:1:1. Let us assume 1 department has 1 manager
and 1 secretary. Now 1 department with 1 manager works with 1 secretary. 1
department with 1 secretary works with 1 manager. 1 manager together with 1
secretary works in 1 department.
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