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How to add existing user to an existing group?
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How to represent it with UNIQUE indexes and foreign keys?
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how to verify users are in group
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How to associate a user to multiple scheme of a database?
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Are multiple-users protected from each other differently than apps?
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many-to-many relationship in database design
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How do you effectively model inheritance in a database?
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Key-Value-Observing a to-many relationship in Cocoa
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Are nested transactions allowed in MySQL?
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User and associated Post
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many to many relationship bridge table dilemma
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Query Parent Accounts with its child accounts
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How to handle people impersonating other people by choosing the same display name