In Unified Modeling Language (UML)primary Keys May Be Blank

question 21

True/False

In Unified Modeling Language (UML)primary keys may be blank.

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Definitions:

European Immigrants

Individuals from Europe who have moved to another country, historically significant in the context of migration to the Americas, Australia, and other regions.

Railroad Development

The period of rapid expansion and construction of railroads, significantly influencing economic growth, settlement patterns, and regional connectivity.

Urban

Pertains to cities or towns, often characterized by higher population density and vast human features in contrast to areas outside of cities.

Southern Slaveholders

were individuals or families in the Southern United States who owned slaves, particularly before the Civil War and the abolition of slavery.