In an ER diagram, the weak entity is typically depicted with a _________ ___________, and the relationship between the weak entity and the strong entity is shown with a __________ ___________.

Question

BlackTom AI · Accepted Answer

Recasting the question in my own words: In an ER diagram, how is a weak entity shown, and how is the relationship to its owning (strong) entity depicted?
Option 1: 'double rectangle, double line' — This combination matches common notation: a weak entity is drawn as a double rectangle, and the identifying relationship to its strong entity is represented by a double line connecting the weak entity to the strong entity. This reflects the special identifying relationship that weak entities have with their owner.
Option 2: 'double square, single line' — A double square is not a standard symbol for any ER element, and a single line would not convey the identifying relationship between a weak and strong entity. This misrepresents both the weak entity symbol and the distinctive relationship styling.
Option 3: 'rectangle, single line' — A single rectangle indicates a regular (strong) entity, not a weak one. The single line between entities would not indicate the identifying relationship characteristic of weak entities, so this option fails to capture the required special notation.
Option 4: 'round-cornered rectangle, dotted line' — Round-cornered rectangles are not the standard for weak entities, and a dotted line does not convey the identifying relationship used in weak-strong entity links. This choice mismatches both the entity depiction and the relationship styling.
In summary, the correct convention places the weak entity inside a double rectangle and uses a double line to connect it to its identifying (strong) entity, signaling the dependent ownership and the identifying relationship. The other options either misuse the shapes or misrepresent the connection style, leading to incorrect interpretations of weak-entity notation.

In an ER diagram, the weak entity is typically depicted with a ___ _, and the relationship between the weak entity and the strong entity is shown with a _____.单项选择题

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In an ER diagram, the weak entity is typically depicted with a _________ ___________, and the relationship between the weak entity and the strong entity is shown with a __________ ___________.单项选择题