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How to think in LastN

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Posted on by dalacarelia_196 648

Hello LastN problem maybee 
In my table, I want to display the 3 latest entries per MemberID in my gallery  .
I was thinking about addcolumns or group by  and now iam just confused  

pls any hints is welcome here 

dalacarelia_196_0-1694846279153.png

 

 

Categories:
Building Power Apps
I have the same question (0)
  • SpongYe Profile Picture
    SpongYe 5,909 Super User 2026 Season 2 on at

    Hi @dalacarelia_196 

     

    The LastN function returns the last set of records of a table; the second argument specifies the number of records to return. What you want needs a little adjustments to take the last 3 records per member.

     

    This is my example data:

    ClearCollect(
 colMembers,
 {ID: "1", MemeberID:"100", Meetingdate: Today()-4},
 {ID: "2", MemeberID:"100", Meetingdate: Today()-3},
 {ID: "3", MemeberID:"100", Meetingdate: Today()-2},
 {ID: "4", MemeberID:"100", Meetingdate: Today()-1},
 {ID: "5", MemeberID:"200", Meetingdate: Today()-3},
 {ID: "6", MemeberID:"200", Meetingdate: Today()-2},
 {ID: "7", MemeberID:"200", Meetingdate: Today()-1},
 {ID: "8", MemeberID:"300", Meetingdate: Today()-3},
 {ID: "9", MemeberID:"300", Meetingdate: Today()-2},
 {ID: "10", MemeberID:"300", Meetingdate: Today()-1}
)

     

    This creates a coltestMembers that you can use in your gallery. 

    Clear(coltestMembers);
With(
 { _colMember: Distinct(colMembers, MemeberID) },
 ForAll(
 _colMember,
 Collect( coltestMembers, LastN(Filter(colMembers, MemeberID = _colMember[@Value]), 3))
 )
)

     

    Hope this solves your problem. 


    ------------------------------------------------------------------------------------------------------------------------------
    If I have answered your question, please mark your post as Solved. Remember, you can accept more than one post as a solution.

    If you like my response, please give it a Thumbs Up.

  • dalacarelia_196 Profile Picture
    dalacarelia_196 648 on at

    Hello its complain about the ; after Clear(colMembers);

    I am from sweden so thats ; instead of , digits 


    ;;Clear(coltestMembers);
    With(
    { _colMember: Distinct(colMembers; MemeberID) };
    ForAll(
    _colMember;
    Collect( coltestMembers; LastN(Filter(colMembers; MemeberID = _colMember[@Value]); 3))
    )
    )

  • SpongYe Profile Picture
    SpongYe 5,909 Super User 2026 Season 2 on at

    @dalacarelia_196 

     

    Thanks for the headup. Did my solution solved your issue? 


    ------------------------------------------------------------------------------------------------------------------------------
    If I have answered your question, please mark your post as Solved.

    Remember, you can accept more than one post as a solution.

    If you like my response, please give it a Thumbs Up.

  • dalacarelia_196 Profile Picture
    dalacarelia_196 648 on at

    No its givng problem at the , The ClearCollect works out fine 


    Clear(coltestMembers);
    With(
    { _colMember: Distinct(colMembers; MemeberID) };
    ForAll(
    _colMember;
    Collect( coltestMembers; LastN(Filter(colMembers; MemeberID = _colMember[@Value]); 3))
    )
    )


    dalacarelia_196_0-1694853703737.pngdalacarelia_196_1-1694853755695.png

     

  • SpongYe Profile Picture
    SpongYe 5,909 Super User 2026 Season 2 on at

    ' its complain about the ; after Clear(colMembers);

     

    For your issue use two semicolons (;;).

     

     

    Clear(coltestMembers);;
With(
 { _colMember: Distinct(colMembers; MemeberID) };
 ForAll(
 _colMember;
 Collect( coltestMembers; LastN(Filter(colMembers; MemeberID = _colMember[@Value]); 3))
 )
)

     

     

    Documentation you can find here: https://learn.microsoft.com/en-us/power-platform/power-fx/global#formula-separators-and-chaining-operator
    ------------------------------------------------------------------------------------------------------------------------------
    If I have answered your question, please mark your post as Solved. Remember, you can accept more than one post as a solution.

    If you like my response, please give it a Thumbs Up.
  • dalacarelia_196 Profile Picture
    dalacarelia_196 648 on at

    In your code it is  and that gives med red dots 

    Collect( coltestMembers; LastN(Filter(colMembers; MemeberID = _colMember[@Value]); 3))


    so i chnged to ( in ) 
    Collect(coltestMembers; LastN(Filter(colMembers; MemberID in _colMember.Value); 3))

    ClearCollect(colMembers;
    {ID: "1"; MemberID:"100"; Meetingdate:"2023-01-01"};
    {ID: "2"; MemberID:"200"; Meetingdate:"2023-01-02"};
    {ID: "3"; MemberID:"300"; Meetingdate:"2023-01-03"};
    {ID: "4"; MemberID:"100"; Meetingdate:"2023-01-04"};
    {ID: "5"; MemberID:"200"; Meetingdate:"2023-01-05"};
    {ID: "6"; MemberID:"300"; Meetingdate:"2023-01-06"};
    {ID: "7"; MemberID:"100"; Meetingdate:"2023-01-07"};
    {ID: "8"; MemberID:"200"; Meetingdate:"2023-01-08"};
    {ID: "9"; MemberID:"300"; Meetingdate:"2023-01-09"};
    {ID: "10"; MemberID:"100"; Meetingdate:"2023-01-10"};
    {ID: "11"; MemberID:"200"; Meetingdate:"2023-01-11"};
    {ID: "12"; MemberID:"300"; Meetingdate:"2023-01-12"};
    {ID: "13"; MemberID:"100"; Meetingdate:"2023-01-13"};
    {ID: "14"; MemberID:"200"; Meetingdate:"2023-01-14"};
    {ID: "15"; MemberID:"300"; Meetingdate:"2023-01-15"};
    {ID: "16"; MemberID:"100"; Meetingdate:"2023-01-16"};
    {ID: "17"; MemberID:"200"; Meetingdate:"2023-01-17"};
    {ID: "18"; MemberID:"300"; Meetingdate:"2023-01-18"};
    {ID: "19"; MemberID:"100"; Meetingdate:"2023-01-19"};
    {ID: "20"; MemberID:"200"; Meetingdate:"2023-01-20"};
    {ID: "21"; MemberID:"300"; Meetingdate:"2023-01-21"};
    {ID: "22"; MemberID:"100"; Meetingdate:"2023-01-22"};
    {ID: "23"; MemberID:"200"; Meetingdate:"2023-01-23"};
    {ID: "24"; MemberID:"300"; Meetingdate:"2023-01-24"};
    {ID: "25"; MemberID:"100"; Meetingdate:"2023-01-25"};
    {ID: "26"; MemberID:"200"; Meetingdate:"2023-01-26"};
    {ID: "27"; MemberID:"300"; Meetingdate:"2023-01-27"};
    {ID: "28"; MemberID:"100"; Meetingdate:"2023-01-28"};
    {ID: "29"; MemberID:"200"; Meetingdate:"2023-01-29"};
    {ID: "30"; MemberID:"300"; Meetingdate:"2023-01-30"};
    {ID: "31"; MemberID:"100"; Meetingdate:"2023-01-31"};
    {ID: "32"; MemberID:"200"; Meetingdate:"2023-02-01"};
    {ID: "33"; MemberID:"300"; Meetingdate:"2023-02-02"};
    {ID: "34"; MemberID:"100"; Meetingdate:"2023-02-03"};
    {ID: "35"; MemberID:"200"; Meetingdate:"2023-02-04"};
    {ID: "36"; MemberID:"300"; Meetingdate:"2023-02-05"};
    {ID: "37"; MemberID:"100"; Meetingdate:"2023-02-06"};
    {ID: "38"; MemberID:"200"; Meetingdate:"2023-02-07"};
    {ID: "39"; MemberID:"300"; Meetingdate:"2023-02-08"};
    {ID: "40"; MemberID:"100"; Meetingdate:"2023-02-09"};
    {ID: "41"; MemberID:"200"; Meetingdate:"2023-02-10"};
    {ID: "42"; MemberID:"300"; Meetingdate:"2023-02-11"};
    {ID: "43"; MemberID:"100"; Meetingdate:"2023-02-12"};
    {ID: "44"; MemberID:"200"; Meetingdate:"2023-02-13"};
    {ID: "45"; MemberID:"300"; Meetingdate:"2023-02-14"};
    {ID: "46"; MemberID:"100"; Meetingdate:"2023-02-15"};
    {ID: "47"; MemberID:"200"; Meetingdate:"2023-02-16"};
    {ID: "48"; MemberID:"300"; Meetingdate:"2023-02-17"};
    {ID: "49"; MemberID:"100"; Meetingdate:"2023-02-18"};
    {ID: "50"; MemberID:"200"; Meetingdate:"2023-02-19"};
    {ID: "51"; MemberID:"300"; Meetingdate:"2023-02-20"}

     

    )

     

     

    Clear(coltestMembers);;
    With(
    { _colMember: Distinct(colMembers; MemberID) };
    ForAll(
    _colMember;
    Collect(coltestMembers; LastN(Filter(colMembers; MemberID in _colMember.Value); 3))
    )
    )


    Outcome is this 

    dalacarelia_196_0-1694894405948.png

     

    But it sholud be 
    The last three records for MemberID "100" should be records with IDs 43, 46, and 49.

    The last three records for MemberID "200" should be records with IDs 44, 47, and 50.

    The last three records for MemberID "300" should be records with IDs 45, 48, and 51.



  • Verified answer
    WarrenBelz Profile Picture
    WarrenBelz 156,454 Most Valuable Professional on at

    Hi @dalacarelia_196 ,

    Yuo need to go a bit beyond where you are heading with this - try this

    Clear(colTestMembers);
With(
 {
 _Members: 
 Sort(
 colMembers,
 Value(ID),
 SortOrder.Descending
 )
 },
 With(
 {
 _IDs: 
 GroupBy(
 _Members,
 "MemberID",
 "Data"
 )
 },
 ForAll(
 _IDs As _Items,
 Collect(
 colTestMembers,
 FirstN(
 Filter(
 _Members,
 MemberID = _Items.MemberID
 ),
 3
 )
 )
 )
 )
)

     

    Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

    MVP (Business Applications)   Visit my blog Practical Power Apps

  • dalacarelia_196 Profile Picture
    dalacarelia_196 648 on at

    Its problem in the For All Powerapps says 
    Incompatible type. The collection cannot contain values of that type.

    dalacarelia_196_0-1694971139028.png

     



    ClearCollect(colMembers;
    {ID: "1"; MemberID:"100"; Meetingdate:"2023-01-01"};
    {ID: "2"; MemberID:"200"; Meetingdate:"2023-01-02"};
    {ID: "3"; MemberID:"300"; Meetingdate:"2023-01-03"};
    {ID: "4"; MemberID:"100"; Meetingdate:"2023-01-04"};
    {ID: "5"; MemberID:"200"; Meetingdate:"2023-01-05"};
    {ID: "6"; MemberID:"300"; Meetingdate:"2023-01-06"};
    {ID: "7"; MemberID:"100"; Meetingdate:"2023-01-07"};
    {ID: "8"; MemberID:"200"; Meetingdate:"2023-01-08"};
    {ID: "9"; MemberID:"300"; Meetingdate:"2023-01-09"};
    {ID: "10"; MemberID:"100"; Meetingdate:"2023-01-10"};
    {ID: "11"; MemberID:"200"; Meetingdate:"2023-01-11"};
    {ID: "12"; MemberID:"300"; Meetingdate:"2023-01-12"};
    {ID: "13"; MemberID:"100"; Meetingdate:"2023-01-13"};
    {ID: "14"; MemberID:"200"; Meetingdate:"2023-01-14"};
    {ID: "15"; MemberID:"300"; Meetingdate:"2023-01-15"};
    {ID: "16"; MemberID:"100"; Meetingdate:"2023-01-16"};
    {ID: "17"; MemberID:"200"; Meetingdate:"2023-01-17"};
    {ID: "18"; MemberID:"300"; Meetingdate:"2023-01-18"};
    {ID: "19"; MemberID:"100"; Meetingdate:"2023-01-19"};
    {ID: "20"; MemberID:"200"; Meetingdate:"2023-01-20"};
    {ID: "21"; MemberID:"300"; Meetingdate:"2023-01-21"};
    {ID: "22"; MemberID:"100"; Meetingdate:"2023-01-22"};
    {ID: "23"; MemberID:"200"; Meetingdate:"2023-01-23"};
    {ID: "24"; MemberID:"300"; Meetingdate:"2023-01-24"};
    {ID: "25"; MemberID:"100"; Meetingdate:"2023-01-25"};
    {ID: "26"; MemberID:"200"; Meetingdate:"2023-01-26"};
    {ID: "27"; MemberID:"300"; Meetingdate:"2023-01-27"};
    {ID: "28"; MemberID:"100"; Meetingdate:"2023-01-28"};
    {ID: "29"; MemberID:"200"; Meetingdate:"2023-01-29"};
    {ID: "30"; MemberID:"300"; Meetingdate:"2023-01-30"};
    {ID: "31"; MemberID:"100"; Meetingdate:"2023-01-31"};
    {ID: "32"; MemberID:"200"; Meetingdate:"2023-02-01"};
    {ID: "33"; MemberID:"300"; Meetingdate:"2023-02-02"};
    {ID: "34"; MemberID:"100"; Meetingdate:"2023-02-03"};
    {ID: "35"; MemberID:"200"; Meetingdate:"2023-02-04"};
    {ID: "36"; MemberID:"300"; Meetingdate:"2023-02-05"};
    {ID: "37"; MemberID:"100"; Meetingdate:"2023-02-06"};
    {ID: "38"; MemberID:"200"; Meetingdate:"2023-02-07"};
    {ID: "39"; MemberID:"300"; Meetingdate:"2023-02-08"};
    {ID: "40"; MemberID:"100"; Meetingdate:"2023-02-09"};
    {ID: "41"; MemberID:"200"; Meetingdate:"2023-02-10"};
    {ID: "42"; MemberID:"300"; Meetingdate:"2023-02-11"};
    {ID: "43"; MemberID:"100"; Meetingdate:"2023-02-12"};
    {ID: "44"; MemberID:"200"; Meetingdate:"2023-02-13"};
    {ID: "45"; MemberID:"300"; Meetingdate:"2023-02-14"};
    {ID: "46"; MemberID:"100"; Meetingdate:"2023-02-15"};
    {ID: "47"; MemberID:"200"; Meetingdate:"2023-02-16"};
    {ID: "48"; MemberID:"300"; Meetingdate:"2023-02-17"};
    {ID: "49"; MemberID:"100"; Meetingdate:"2023-02-18"};
    {ID: "50"; MemberID:"200"; Meetingdate:"2023-02-19"};
    {ID: "51"; MemberID:"300"; Meetingdate:"2023-02-20"}
    )

     

    ;;Clear(colTestMembers)

    ;;With(
    {
    _Members:
    Sort(
    colMembers;
    Value(ID);
    SortOrder.Descending
    )
    };
    With(
    {
    _IDs:
    GroupBy(
    _Members;
    "MemberID";
    "Data"
    )
    };
    ForAll(
    _IDs As _Items;
    Collect(
    colTestMembers;
    FirstN(
    Filter(
    _Members;
    MemberID = _Items.MemberID
    );
    3
    )
    )
    )
    )
    )

     

  • dalacarelia_196 Profile Picture
    dalacarelia_196 648 on at

    Thank you sir you guys always send me in to the right direction , misspelleing is realy hard and this jumping between languages 🙂 ..

    But it keep my brain working 🙂

     


    ClearCollect(colMembers;
    {ID: "1"; MemberID:"100"; Meetingdate:"2023-01-01"};
    {ID: "2"; MemberID:"200"; Meetingdate:"2023-01-02"};
    {ID: "3"; MemberID:"300"; Meetingdate:"2023-01-03"};
    {ID: "4"; MemberID:"100"; Meetingdate:"2023-01-04"};
    {ID: "5"; MemberID:"200"; Meetingdate:"2023-01-05"};
    {ID: "6"; MemberID:"300"; Meetingdate:"2023-01-06"};
    {ID: "7"; MemberID:"100"; Meetingdate:"2023-01-07"};
    {ID: "8"; MemberID:"200"; Meetingdate:"2023-01-08"};
    {ID: "9"; MemberID:"300"; Meetingdate:"2023-01-09"};
    {ID: "10"; MemberID:"100"; Meetingdate:"2023-01-10"};
    {ID: "11"; MemberID:"200"; Meetingdate:"2023-01-11"};
    {ID: "12"; MemberID:"300"; Meetingdate:"2023-01-12"};
    {ID: "13"; MemberID:"100"; Meetingdate:"2023-01-13"};
    {ID: "14"; MemberID:"200"; Meetingdate:"2023-01-14"};
    {ID: "15"; MemberID:"300"; Meetingdate:"2023-01-15"};
    {ID: "16"; MemberID:"100"; Meetingdate:"2023-01-16"};
    {ID: "17"; MemberID:"200"; Meetingdate:"2023-01-17"};
    {ID: "18"; MemberID:"300"; Meetingdate:"2023-01-18"};
    {ID: "19"; MemberID:"100"; Meetingdate:"2023-01-19"};
    {ID: "20"; MemberID:"200"; Meetingdate:"2023-01-20"};
    {ID: "21"; MemberID:"300"; Meetingdate:"2023-01-21"};
    {ID: "22"; MemberID:"100"; Meetingdate:"2023-01-22"};
    {ID: "23"; MemberID:"200"; Meetingdate:"2023-01-23"};
    {ID: "24"; MemberID:"300"; Meetingdate:"2023-01-24"};
    {ID: "25"; MemberID:"100"; Meetingdate:"2023-01-25"};
    {ID: "26"; MemberID:"200"; Meetingdate:"2023-01-26"};
    {ID: "27"; MemberID:"300"; Meetingdate:"2023-01-27"};
    {ID: "28"; MemberID:"100"; Meetingdate:"2023-01-28"};
    {ID: "29"; MemberID:"200"; Meetingdate:"2023-01-29"};
    {ID: "30"; MemberID:"300"; Meetingdate:"2023-01-30"};
    {ID: "31"; MemberID:"100"; Meetingdate:"2023-01-31"};
    {ID: "32"; MemberID:"200"; Meetingdate:"2023-02-01"};
    {ID: "33"; MemberID:"300"; Meetingdate:"2023-02-02"};
    {ID: "34"; MemberID:"100"; Meetingdate:"2023-02-03"};
    {ID: "35"; MemberID:"200"; Meetingdate:"2023-02-04"};
    {ID: "36"; MemberID:"300"; Meetingdate:"2023-02-05"};
    {ID: "37"; MemberID:"100"; Meetingdate:"2023-02-06"};
    {ID: "38"; MemberID:"200"; Meetingdate:"2023-02-07"};
    {ID: "39"; MemberID:"300"; Meetingdate:"2023-02-08"};
    {ID: "40"; MemberID:"100"; Meetingdate:"2023-02-09"};
    {ID: "41"; MemberID:"200"; Meetingdate:"2023-02-10"};
    {ID: "42"; MemberID:"300"; Meetingdate:"2023-02-11"};
    {ID: "43"; MemberID:"100"; Meetingdate:"2023-02-12"};
    {ID: "44"; MemberID:"200"; Meetingdate:"2023-02-13"};
    {ID: "45"; MemberID:"300"; Meetingdate:"2023-02-14"};
    {ID: "46"; MemberID:"100"; Meetingdate:"2023-02-15"};
    {ID: "47"; MemberID:"200"; Meetingdate:"2023-02-16"};
    {ID: "48"; MemberID:"300"; Meetingdate:"2023-02-17"};
    {ID: "49"; MemberID:"100"; Meetingdate:"2023-02-18"};
    {ID: "50"; MemberID:"200"; Meetingdate:"2023-02-19"};
    {ID: "51"; MemberID:"300"; Meetingdate:"2023-02-20"}
    )

     

    ;;Clear(colTestMembers);;
    With(
    {
    _Members:
    Sort(
    colMembers;
    Value(ID);
    SortOrder.Descending
    )
    };
    With(
    {
    _IDs:
    GroupBy(
    _Members;
    "MemberID";
    "Data"
    )
    };
    ForAll(
    _IDs As _Items;
    Collect(
    colTestMembers;
    FirstN(
    Filter(
    _Members;
    MemberID = _Items.MemberID
    );
    3
    )
    )
    )
    )
    )

     

     

     

     

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