您可以做的是将视觉对象中的 customer_id 作为列拖动，并确保将其设置为不同的计数.

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

选择你的视觉对象，进入你可以看到列的值下的视觉化面板，点击向下箭头，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: