Bind data from 2 datasets into one tablix in SSRS - reporting-services

Question

I have to combine data from 2 different datasets to single Tablix which should be sorted on Date Time.
For Example:
Dataset1:
DateTime Product Employee
2020-08-13 18:10:53.263 ABC A
Dataset2:
DateTime Product Employee
2020-08-13 19:10:20.000 XYZ A
ResultSet:
DateTime Product Employee
2020-08-13 18:10:53.263 ABC A
2020-08-13 19:10:20.000 XYZ A
Note: I cannot combine data from both the datasets at the database level as the datasets refer to 2 different datasources.
I have an idea on LOOKUP but I guess that can be used at column level but my case I need to display the data at row level from 2 datasets based on Datetime sort.
Could someone please suggest if there is a way to achieve this.
Thank you in advance!!

Answer 1

If the databases are on the same server then you can simply UNION the results together something like
SELECT [DateTime], [Product], [Employee]
FROM [database_A].[mySchema].[myFirstTable]
UNION ALL
SELECT [DateTime], [Product], [Employee]
FROM [database_B].[myotherSchema].[myOtherFirstTable]
If they are on different servers then Create a linked server (details on how to do this are here)
Then use the same query but preceding the 2nd reference with the server name / link server name
SELECT [DateTime], [Product], [Employee]
FROM [database_A].[mySchema].[myFirstTable]
UNION ALL
SELECT [DateTime], [Product], [Employee]
FROM [myLinkedServerName].[database_B].[myotherSchema].[myOtherFirstTable]
Now you'll have a single dataset with all your data and no headache!
If you have two existing Stored Procs
If you have two SP then you can still do this but in a slightly different way. Something like
CREATE TABLE #t([DateTime] DateTime, Product varchar(50), Employee int)
INSERT INTO #t
EXEC #myFirstProc
INSERT INTO #t
EXEC #mySecondProc
SELECT * FROM #t