Question

I have a problem with design an entity to entity relation in my SQL database.
I have an entity that acts as a ‘group’. And all groups has a relations to each other.

As an example:
GroupA and GroupB has a relation from groupA to groupB and vice versa with a bool.
It is like a 2D matrix:

Name | GroupA | Group B |

Group A | true | false

Group B | false | true |

The groups are dynamic, may there are more or less groups.
Now, how should I store this in my database?

Sorry for my bad english, and I hope someone understand what I mean 🙂

Answer 1

You need two table:

GROUP
Name
...


GROUPTOGROUP
BaseGroupID
ConnectedToGroupID
True/False

So you can define any connection in the GroupToGroup.