您可以做的就是拖拽customer_id在视觉效果列中，并确保将其设置为不重复计数。

What you can do is drag teh customer_id in the visual as column and ensure it is set to count distinct.

选择您的视觉效果，转到值下的可见化面板，您可以看到该列，单击向下箭头，弹出窗口将显示：

Select your visual, go the the vusialization panel under values you can see the column, click on arrowdown, popus will show: