语法:Foreign Key(column[,...n])references referenced_table_name[(ref_column[,...n])][on delete cascade][on update cascade]注释:column:列名referenced_table_name:外键参考的主键表名称ref_name:外键要参考的表的主键列on delete:删除级联on update:更新级联
?
语法:Foreign Key(column[,...n])references referenced_table_name[(ref_column[,...n])][on delete cascade][on update cascade]注释:column:列名referenced_table_name:外键参考的主键表名称ref_name:外键要参考的表的主键列on delete:删除级联on update:更新级联
?