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A. A table can have only one primary key and one foreign key.
B. A table can have only one primary key but multiple foreign keys.
C. Only the primary key can be defined at the column and table levels.
D. The foreign key and parent table primary key must have the same name.
E. Both primary key and foreign key constraints can be defined at both column and table levels.来自 “ ITPUB博客 ” ,链接:https://blog.itpub.net/17013648/viewspace-1158779/ ,如需转载,请注明出处,否则将追究法律责任。