我有以下表格:SQL架构设计
+---+---------+
|id | name | foreign_key1 = this table's id
+---+---------+
|1 | White |
|2 | Black |
+---+---------+
+----+------+-------------+
|id | name | foreign_key1|
+----+------+-------------+
|1 | Grey | 1 |
|2 | Grey | 2 |
+----+------+-------------+
有,我可以只用一行坚持最后一个表格的信息的方法吗?那么这张桌子可以表示灰色在一行中都是白色和黑色?