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 _____.

查看解析

登录即可查看完整答案

类似问题

In the following diagram, which of the answers below is true?

Identify the minimum cardinality of any E-R Diagram relationship:

In an ER-Diagram, relationship cardinality is represented as a:

in ERDplus a label:

A pair of perpendicular (crossing) lines across a relationship line, next to an entity, indicates that:

Observe the ER Diagram for the ABC Retailer: Which of the following is true according to the ABC Retailer ER diagram?

Question at position 49 In an ERD, cardinality specifiesThe range of allowable values for an attributeThe unique identifier for an entityThe minimum and maximum number of instances of one entity that can be associated with instances of another entityThe number of attributes within an entity

Question at position 16 What does a "relationship" in an ERD represent?A specific attribute within an entityThe primary attribute of an entityAn association between two or more entitiesThe unique identifier of an entity

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单