I have prepared the documentation with step by step guide.You can view directly on SlideShare.

On Slideshare you can also download the PDF Version ( You need Adobe Reader / Foxit Reader to view it )

Here is the SlideShare Link – PS Query with Union.

For those you are not aware of how to download SlideShare Presentation, Here is the small Visuals that will help you.

SlideShare Presentation Download

As usual, Please do comment if you find it useful or it can be improve more.

Hope this helps 🙂