比方说，我有两个（或三个）表。
PLAYER_POINT
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PLAYER_ID | PK, FK -> PLAYER
POINT_ID | PK, FK -> POINT
EARNED | INT
PLAYER_POINT_YEAR
----------------------------------------
PLAYER_ID | PK, FK -> PLAYER_POINT
POINT_ID | PK, FK -> PLAYER_POINT
YEAR | PK
EARNED | INT
PLAYER_POINT_MONTH
----------------------------------------
PLAYER_ID | PK, FK -> PLAYER_POINT_YEAR
POINT_ID | PK, FK -> PLAYER_POINT_YEAR
YEAR | PK, FK -> PLAYER_POINT_YEAR
MONTH | PK
EARNED | INT
JPA是否可以使用扩展复合主键集的@Inheritance？
PK对于继承树是固定的。使用继承无法做到这一点