A one-to-one relationship between two entities is symbolized in a diagram by a line that ends with:

Question

BlackTom AI · Accepted Answer

When interpreting a one-to-one relationship in a diagram, we need to understand how the notation signals cardinality.
Option 1: 'a crow's foot.' In crow's foot notation, a crow's foot at an end of a line typically denotes the 'many' side, not the 'one' side, so this would suggest a many-to-something relationship rather than one-to-one.
Option 2: 'a crow's foot preceded by two short marks.' The presence of a crow's foot would indicate at least one end is many; adding two short marks at the start would still imply a one-to-many or many-to-many nuance on that end, which is inconsistent with a strict one-to-one mapping.
Option 3: 'one short mark.' A single short mark could be interpreted as a single line or a symbol for 'one,' but in standard notation sets, the 'one' side is shown with a bar or line ending, not simply a lone mark that could be ambiguous. This makes it an unreliable indicator of 1:1.
Option 4: 'two short marks.' In many ER diagrams, especially using certain notations, two short marks (one on each entity side) indicate that each entity instance relates to exactly one instance of the other entity, i.e., a one-to-one relationship. The placement of bars signaling the 'one' side is the key cue here, and having two such marks aligns with the 1:1 constraint.
Option 5: 'a crow's foot topped by a short mark.' This combination implies special notation for a particular relationship type, but it does not match the standard representation of a strict one-to-one association, which is typically shown with bars rather than a crow's foot.
In summary, the presence of two short marks most directly corresponds to the 1:1 constraint, while the other choices either denote 'many' or introduce ambiguous or nonstandard symbolism. The reasoning hinges on correctly mapping the symbols to the cardinality they express in entity-relationship diagrams.

MIDS 301 For Feb 25th Class

A one-to-one relationship between two entities is symbolized in a diagram by a line that ends with:

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