A schematic that describes the manner in which two tables are related to one another in a database is called a(n):

Question

BlackTom AI · Accepted Answer

An entity-relationship diagram (ERD) visually models entities (tables), their attributes, and the relationships (including cardinality) between them, so it is the correct schematic for describing how two tables relate.

1. Relevant knowledge points and concepts
- Entity-Relationship Diagram (ERD): A diagrammatic representation of entities (which map to database tables), attributes (columns), and relationships (associations) between entities, often showing cardinality (one-to-one, one-to-many, many-to-many) and optionality.
- Referential integrity: A database constraint ensuring foreign key values match primary key values in related tables; it is a rule implemented in a schema, not the schematic itself.
- Data dictionary: A textual inventory of data elements, definitions, types and possible values — descriptive, not a visual relationship diagram.
- Data definition (DDL/schema): The formal definition of tables and columns in SQL; again, this is metadata or code rather than a diagram.

2. Step-by-step reasoning
- The question asks for the name of a schematic that describes how two tables are related.
- Match the definition of each option to that description.
- An ERD explicitly shows tables as entities and the relationships between them with visual connectors and cardinality indicators, directly fitting the asked schematic.

3. Intermediate clarification (no numeric calculations required)
- Example: An ERD would show Customer —< Order with CustomerID as the linking foreign key, indicating a one-to-many relationship. This visual explicitly describes how the two tables are related.

4. Why the correct answer is correct
- ERDs are designed to communicate table-to-table relationships graphically, including relationship type and constraints. They are the standard schematic used in database design for this exact purpose.

5. Why the other options are incorrect
- Data definition diagram: Not a standard term; DDL or schema definitions are textual/code-based, not the canonical name for the schematic.
- Referential integrity diagram: Referential integrity is a constraint concept, not the commonly used name for a relationship schematic.
- Data dictionary: Descriptive listing of data elements, not a visual schematic of relationships.
- Intersection relationship diagram: Not a standard, widely accepted term; might confuse with intersection (junction) tables but is not the general schematic name.

6. Conclusion
This explanation shows the visual modeling role of ERDs and rules out the alternatives, confirming the correct answer: entity-relationship diagram.

A schematic that describes the manner in which two tables are related to one another in a database is called a(n): 单项选择题

类似问题

An ERD is:

A schematic of the entire database that describes the relationships in a database is called a(n):

An ERD stands for ___________________________

The above ER diagram indicates that "SSN" is the primary key of "Employee".

ER diagram is used for conceptual data modeling.

请描述学生与在学人员之间的关系

Describe the relationship between DEPARTMENT and TEACHER

更多留学生实用工具

智能学习助手

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