We keep only a compound primary key and a secondary index for each row, and answer all queries from a single index.
我们只保留了一个组合主键和一个辅助索引来完成所有的查询。
If you define a compound key, the order of columns in the primary key matches the order of columns as shown in the table in your diagram.
如果定义复合键，则主键中列的顺序与关系图的表中显示的列顺序匹配。
If you define a compound key, the order of columns in the primary key matches the order of columns as shown in the table in your diagram.
如果定义复合键，则主键中列的顺序与关系图的表中显示的列顺序匹配。
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