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Use Column.Index for getting number of column and Table1.RecNo for getting number of record.
Use it for onDBGridCellClick event. Don't forget that first Column.Index is 0.

procedure TForm1.DBGrid1CellClick(Column: TColumn);
begin
  ShowMessage(
    'Column number - '+IntToStr(Column.Index)+
    '   Record number - '+IntToStr(Table1.RecNo));
end;

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