Why app is still working with the wrong database design? [closed]

strawhat

New Member
I saw a database of an app where Table 'Library' and Table 'PC' are many-many relationshipBut I think Table 'Library' and Table 'PC' should be one-many relationship.However, the app is still working with the wrong database design.My question is if app can be woking all right with wrong relationship database. If wrong database design will cause some problem?
 
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