PowerApps - Merge Two Collections in to one Collection

By Vinod Thachin -
In PowerApps, we can merge two collections in to one collection based on the unique value in the two collection. I had a requirement to merge two collections format as below,

Employee Unplanned Leaves Data List - Collection 1

Employee ID 
Employee Name 
Employee Leave Date
Employee Leave Applied Date
Employee Unplanned Leaves

Employee Planned Leaves Data List - Collection 2

Employee ID 
Employee Name 
Employee Leave Date
Employee Leave Applied Date
Employee Planed Leaves

These are two different collection and we need to merge these two items based on the employee id. I have used following formula to merge the collections


ClearCollect(
    OutputCollection,
    Collect(
             AddColumns(
                                      collection1,
                                      "Employee Planned Leave",
                                      LookUp(collection2,EmployeeID=collection1[@EmployeeID],Employee Planned leave),
                                      "Employee Planned Leave Date",
                                      LookUp(collection2,EmployeeID=collection1[@EmployeeID],Employee Planned Leave Date)
                                     ),                            
               
                             Filter(collection2,Not(EmployeeID in collection1.EmployeeID)),
                             
           )
         )

Here I am using two collection and getting the values into collection1 

Get the matched Items
Get Non Matched Items.

Matched Items will be added to the respective records and Employee Planned Leave and Employee Planned Leave Date. Un0-Matched items will be added as separate records in Planned and Un-planned leave collections,


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