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Delete duplicate values

By : Jstall
Date : July 31 2020, 09:00 AM
I think the issue was by ths following , It deletes all ENAMEs, not only duplicates (i.e. it doesn't leave one row). Try something like
Table contents at beginning:
code :
SQL> select * From temp order by id;

        ID ENAME
---------- ----------
         1 Little
         2 Little          --> duplicate ENAME
         3 Foot
SQL> delete from temp a
  2  where a.rowid > (select min(b.rowid)
  3                   from temp b
  4                   where b.ename = a.ename
  5                  );

1 row deleted.
SQL> select * From temp order by id;

        ID ENAME
---------- ----------
         1 Little
         3 Foot


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How to Delete Duplicate Values in a HashSet

By : karthick.r
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I think, you are missing something here. In the question you mentioned HashMap and in the implementation you have HashSet.
Remember, HashSet implements the Set interface, which does not contain duplicates.

DELETE duplicate values in SQL

By : oscillo
Date : March 29 2020, 07:55 AM
hop of those help? I'll take a stab at your problem. This is only a guess, based on the query you provided. A complete question would have described what exactly you mean by a duplicate row.
code :
delete from Registrations
where exists (
    select 1
    from Registrations r2
    where   r2.UserItemId = Registrations.UserItemId
        and r2.CourseOfferingId = Registrations.CourseOfferingId
        and r2.Id < Registrations.Id

this code is supposed to delete duplicate values and delete empty spaces but it is deleting unique values as well

By : Sean Patrick Parrish
Date : March 29 2020, 07:55 AM
I hope this helps . You can do that in simply just one line of code with ES6 feature and Set :
code :
var fin = ["Vivek","Vivek","Mak","Nik","Mak","Hir","Hari","Nur","Nik"];

var result = [...new Set(fin)];

console.log("Fin Total :" , fin.length , ", Result Total :" , result.length);


How do I delete duplicate values in one row of a 2D Numpy array, and also delete the corresponding value in the other ro

By : Cambridge Technology
Date : March 29 2020, 07:55 AM
I wish this help you Using np.unique with return_index=True:
code :
_, idx = np.unique(x[0], return_index=1)
x[:, np.sort(idx)]
array([[ 3,  4,  2,  7,  9,  5,  1],
       [11, 10,  9,  7,  6,  4,  2]])

How to delete duplicate values?

By : malonda
Date : March 29 2020, 07:55 AM
This might help you I dynamically update the cells in columns A and B, and join both values on each row (using &) and place the values in column C. , If i wanted to create a sheet with
code :
-2        -1       0
ColA      ColB     ColC
First1    Last1    First1Last1
First2    Last2    First2Last2
First3    Last3    First3Last3
First4    Last4
Private Sub Worksheet_Change(ByVal Target As Range)
    If Intersect(Target, Columns(3)) Is Nothing Then Exit Sub
    If Target.Count > 1 Then Exit Sub
    If Application.CountIfs(Range("C1:C12"),Target.Value) > 1 Then 'checks for first/last name
        MsgBox("The name " & Target.Offset(0,-2).Value & " " & Target.Offset(0,-1).Value & " already exists." & vbNewLine & "Please enter a new name.")
    End If
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
    If Target.Count > 1 Then Exit Sub
    Dim r as long
    r = target.row
    If isempty(cells(r,1)) or isempty(cells(r,2)) then exitsub
    If Application.CountIfs(Range("B1:B12"),cells(r,2).Value,Range("A1:A12"),cells(r,1).Value) > 1 Then 'checks for first/last name
        MsgBox("The name " & cells(r,1).Value & " " & cells(r,2).Value & " already exists." & vbNewLine & "Please enter a new name.")
    End If
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
    If Target.Count > 1 Then Exit Sub
    If Intersect(Target, Range(Cells(1, 1), Cells(12, 2))) Is Nothing Then Exit Sub
    Dim r As Long
    r = Target.Row
    If IsEmpty(Cells(r, 1)) Or IsEmpty(Cells(r, 2)) Then Exit Sub
    If Application.CountIfs(Range("B1:B12"), Cells(r, 2).Value, Range("A1:A12"), Cells(r, 1).Value) > 1 Then 'checks for first/last name
        MsgBox ("The name " & Cells(r, 1).Value & " " & Cells(r, 2).Value & " already exists." & vbNewLine & "Please enter a new name.")
        Cells(r, 1).ClearContents
        Cells(r, 2).ClearContents
        Cells(r, 1).Select
    End If
End Sub
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