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Power Automate Get Items from child table based on value in a parent table.

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I have two Sharepoint lists  Parent and child.
Parent has a column "ID".  It also has a date column "CompletionDate"
Child has a column "RequestID" which the powerapp populates with the ID from the parent.
 
How can I retrieve all the rows from the child list where "CompletionDate" has a value?
 
I have used Parse JSON on the parent and child lists and was hoping to put the results into a Get Items action in Power Automate.
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    WarrenBelz Profile Picture
    WarrenBelz 145,475 on at
    Power Automate Get Items from child table based on value in a parent table.
    Hi @AH-02011058-0​​​​​​​
    Probably something like this
    Filter(
       AddColumns(
          ChildList,
             CompDate,
             LookUp(
                ParentList,
                ID = RequestID
             ).CompletionDate
          ),
          !IsBlank(CompDate)
       )
    )
     
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