Connection 1 (ReleaseGroup - Release)
The m-n-relationship between RG and R is necessary, because every RG can be assigned only one platform on which the game was published, but on the other hand there is multi-platform releases.
The m-n-relationship between RG and R is necessary, because every RG can be assigned only one platform on which the game was published, but on the other hand there is multi-platform releases.