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| author | mo khan <mo.khan@gmail.com> | 2020-01-11 20:59:12 -0700 |
|---|---|---|
| committer | mo khan <mo.khan@gmail.com> | 2020-01-11 20:59:12 -0700 |
| commit | 7e4b20c6a6403068e957d0c7c14f59ddaa87b862 (patch) | |
| tree | 375de0d6569538b26b5170d7be7f2deea79fa644 /doc/01-introduction.md | |
| parent | b1884a094d2cedfbcc79ee29c66155ceda97095b (diff) | |
Add definitions for cardinality
Diffstat (limited to 'doc/01-introduction.md')
| -rw-r--r-- | doc/01-introduction.md | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/01-introduction.md b/doc/01-introduction.md index 23184c1..9e61454 100644 --- a/doc/01-introduction.md +++ b/doc/01-introduction.md @@ -102,6 +102,10 @@ Associations between tables are defined through foreign keys. * Referential integrity constraint: each foreign key value must match a primary key value in another relation or the foreign key value must be null. +#### Cardinality + +* Minimum cardinality: The minimum number of instances of one entity that may be associated with each instance of another entity. +* Maximum cardinality: The maximum number of instances of one entity that may be associated with each instance of another entity. ## Well structured relations |