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Merge pull request #4030 from tomperr/feature/4009_er_multiple_constraints

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feat(er): add multiple key constraints
This commit is contained in:
Sidharth Vinod
2023-01-26 00:16:58 +05:30
committed by GitHub
parent c76728b423 dc0a46f742
commit c51f6df82c
6 changed files with 97 additions and 15 deletions
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22
docs/syntax/entityRelationshipDiagram.md
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@@ -200,14 +200,13 @@ The `type` and `name` values must begin with an alphabetic character and may con
#### Attribute Keys and Comments
Attributes may also have a `key` or comment defined. Keys can be "PK", "FK" or "UK", for Primary Key, Foreign Key or Unique Key. And a `comment` is defined by double quotes at the end of an attribute. Comments themselves cannot have double-quote characters in them.
Attributes may also have a `key` or comment defined. Keys can be `PK`, `FK` or `UK`, for Primary Key, Foreign Key or Unique Key. To specify multiple key constraints on a single attribute, separate them with a comma (e.g., `PK, FK`).. A `comment` is defined by double quotes at the end of an attribute. Comments themselves cannot have double-quote characters in them.
```mermaid-example
erDiagram
CAR ||--o{ NAMED-DRIVER : allows
CAR {
string allowedDriver FK "The license of the allowed driver"
string registrationNumber UK
string registrationNumber PK
string make
string model
string[] parts
@@ -217,17 +216,21 @@ erDiagram
string driversLicense PK "The license #"
string(99) firstName "Only 99 characters are allowed"
string lastName
string phone UK
int age
}
MANUFACTURER only one to zero or more CAR
NAMED-DRIVER {
string carRegistrationNumber PK, FK
string driverLicence PK, FK
}
MANUFACTURER only one to zero or more CAR : makes
```
```mermaid
erDiagram
CAR ||--o{ NAMED-DRIVER : allows
CAR {
string allowedDriver FK "The license of the allowed driver"
string registrationNumber UK
string registrationNumber PK
string make
string model
string[] parts
@@ -237,9 +240,14 @@ erDiagram
string driversLicense PK "The license #"
string(99) firstName "Only 99 characters are allowed"
string lastName
string phone UK
int age
}
MANUFACTURER only one to zero or more CAR
NAMED-DRIVER {
string carRegistrationNumber PK, FK
string driverLicence PK, FK
}
MANUFACTURER only one to zero or more CAR : makes
```
### Other Things