Need to create a report having multiple Datastore values.
There is an easy way to create report for different datastores.
Please try the steps below to create report using a Custom Build report and then follow the steps below:
(Zipped folder attached for screenshots)
-> Open Screenshot11.jpg and then select 1st option as shown and click finish.
-> Select Datastores and Table view as shown in screenshot22.jpg and click next.
-> Select properties for which you want to see the report and then click next as shown in screenshot33.jpg.
-> Click next untill you reach at the filter list option as shown in screenshot44.jpg.
-> Select all Datastores for which you want to create the report.
-> Click Finish and run the report and this will show the data you needed.