图2展示了负载定义与事件定义之间的关系。
Figure 2 shows the relationship between payloads and event definitions.
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。
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.
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