I am currently building out an application that will contain many users, two roles and two groups. Logically we want users to be able to be administrators of other users within the two groups.
User Table
UserID varchar PK
DisplayName
Email
Role int FK `role`.`RoleID`
DATA [jschmo,Joe Schmo,joe@schmo.com,1]
Role Table
RoleID int PK AI
RoleName varchar
DATA [1=Master,2=Admin,3=User]
Group Table
GroupID int PK AI
GroupName
DATA [1=Marketing,2=Infrastructure]
A user could potentially be an admin of both groups. I don't see the option to multi-select foreign keys but as I understand it, having a comma-delimited list in a column is a bad idea and I should use multiple records but I don't like the idea of having multiple records for each user.
Q: How would I keep track of which groups a user is an admin of?
Best Answer
Please, don't store comma-separated lists in a single column. This is just a disaster waiting to happen. If these are separate facts, they should be stored separately.
Your queries (say, to find the admins of a certain group) should be of the form:
And NOT:
Or to find which groups a user is an admin of should be similarly simple: