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content/notes/13-databases-1.md
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@ -110,3 +110,17 @@ relationship types can have attributes
- one to one - one to one
- one to n - one to n
- m to n - m to n
- participation
- total participation
- marked by double line
- relationship is required
- partial
- marked by single line
- relationsihp is not required
## weak entities
- regular tyupes
![cardinality examples|300](https://i.imgur.com/DmHQaVc.png)
![participation example|300](https://i.imgur.com/hH0v4bR.png)