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Sidharth Vinod
2022-09-03 13:30:16 +05:30
parent 661f283dab
commit f6d69b33b3
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docs/entityRelationshipDiagram.md
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@@ -80,10 +80,10 @@ Mermaid syntax for ER diagrams is compatible with PlantUML, with an extension to
Where:
- `first-entity` is the name of an entity. Names must begin with an alphabetic character and may also contain digits, hyphens, and underscores.
- `relationship` describes the way that both entities inter-relate. See below.
- `second-entity` is the name of the other entity.
- `relationship-label` describes the relationship from the perspective of the first entity.
- `first-entity` is the name of an entity. Names must begin with an alphabetic character and may also contain digits, hyphens, and underscores.
- `relationship` describes the way that both entities inter-relate. See below.
- `second-entity` is the name of the other entity.
- `relationship-label` describes the relationship from the perspective of the first entity.
For example:
@@ -97,9 +97,9 @@ Only the `first-entity` part of a statement is mandatory. This makes it possible
The `relationship` part of each statement can be broken down into three sub-components:
- the cardinality of the first entity with respect to the second,
- whether the relationship confers identity on a 'child' entity
- the cardinality of the second entity with respect to the first
- the cardinality of the first entity with respect to the second,
- whether the relationship confers identity on a 'child' entity
- the cardinality of the second entity with respect to the first
Cardinality is a property that describes how many elements of another entity can be related to the entity in question. In the above example a `PROPERTY` can have one or more `ROOM` instances associated to it, whereas a `ROOM` can only be associated with one `PROPERTY`. In each cardinality marker there are two characters. The outermost character represents a maximum value, and the innermost character represents a minimum value. The table below summarises possible cardinalities.
@@ -234,8 +234,8 @@ erDiagram
### Other Things
- If you want the relationship label to be more than one word, you must use double quotes around the phrase
- If you don't want a label at all on a relationship, you must use an empty double-quoted string
- If you want the relationship label to be more than one word, you must use double quotes around the phrase
- If you don't want a label at all on a relationship, you must use an empty double-quoted string
## Styling