Multiple table values in cxGrid

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set up a banded table view
add 4 columns, set 1 on each band
set the fieldnames
and presto

or did you want to automate this ?

then you will have to create the columns manually and provide some distinction in your sql

select 'TABLE_A' table_a, a.*, 'TABLE_B' table_b, b.*, 'TABLE_C' table_c, c.*
from table_a a, table_b b, table_c c
where a.id_a = b.id_a
and b.id_b = c.id_b

then the first time you open the table on the view


procedure TForm1.Button1Click(Sender: TObject);
begin
  CreateDBColumns(Query1);
end;
 
procedure TForm1.CreateDBColumns(Dataset: TDataset);
  function Band(Bands: TcxGridBands; BandCaption: string): integer;
  var I: Integer;
  begin
    Result := -1;
    for I := 0 to Bands.Count-1 do
      if SameText(Bands.Items[I].Caption, BandCaption) then
      begin
        Result := I;
        Break;
      end;
    if Result = -1 then
    begin
      Result := Bands.Add.Index;
      Bands.Items[Result].Caption := BandCaption;
    end;
  end;
var I, BandIndex: Integer;
  afielname: string;
  Col: TcxGridDBBandedColumn;
begin
  with cxGrid1DBBandedTableView1 do
  begin
    BeginUpdate;
    try
      Bands.Clear;
      BandIndex := -1;
      ClearItems;
      for I := 0 to Dataset.FieldCount-1 do
      begin
        aFieldName := Dataset.Fields.Fields[I].FieldName;
        if SameText('table_', Copy(aFieldName, 1, 6)) then
          BandIndex := Band(Bands, Copy(aFieldName, 7, Length(aFieldName)));
        col := CreateColumn;
        Col.DataBinding.FieldName := aFieldName;
        Col.Position.BandIndex := BandIndex;
        Col.Caption := Dataset.Fields.Fields[I].DisplayName;
      end;
    finally
      EndUpdate;
    end;
  end;
end;

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Multiple table values in cxGrid

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