sql - Primary key and composite unique index behavior -


i'm doing little custom membership system , i'm having issues. have these tables (users, roles, applications, membership).

i want this:

users

|userid | applicationid | username | ... |1      | 1             | abc      | ... |1      | 2             | abcd     | ...

"is same user in several apps, despite different username"

roles

|roleid | applicationid | rolename | ... |1      | 1             | xxx      | ... |1      | 2             | xxx      | ...

"is same role in several apps"

with userid/roleid primary key , userid/roleid-applicationid composite unique index know system won't allow me create user in 2 applications.

i tried composite primary keys head ache after make correct fks because membership table needs recognize application (one user can have several credentials several apps).

what best way do, if possible?


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