Lua表按值升序排序

我有一个需要按升序排序sel_notes[i].Pitch的表。

这些是在midi编辑器中选择的midi音符。

sel_notes表：

sel_notes = {}
sel_notes[pitch] = {Pitch = pitch, Idx = i}
sel_notes[i] = {Pitch = pitch, Idx = i}

使用table.save-1.0.lua保存sel_notes表如下：

return {
-- Table: {1}
   {
      [64]={2},
      [65]={3},
      [66]={4},
      [67]={5},
      [52]={6},
      [69]={7},
      [68]={8},
      [55]={9},
      [56]={10},
      [57]={11},
      [58]={12},
      [59]={13},
      [60]={14},
      [61]={15},
      [62]={16},
      [63]={17},
   },
-- Table: {2}
   {
      ["Pitch"]=63,
      ["Idx"]=64,
   },
-- Table: {3}
   {
      ["Pitch"]=52,
      ["Idx"]=65,
   },
-- Table: {4}
   {
      ["Pitch"]=58,
      ["Idx"]=66,
   },
-- Table: {5}
   {
      ["Pitch"]=52,
      ["Idx"]=67,
   },
-- Table: {6}
   {
      ["Pitch"]=52,
      ["Idx"]=67,
   },
-- Table: {7}
   {
      ["Pitch"]=58,
      ["Idx"]=69,
   },
-- Table: {8}
   {
      ["Pitch"]=63,
      ["Idx"]=68,
   },
-- Table: {9}
   {
      ["Pitch"]=52,
      ["Idx"]=55,
   },
-- Table: {10}
   {
      ["Pitch"]=58,
      ["Idx"]=56,
   },
-- Table: {11}
   {
      ["Pitch"]=63,
      ["Idx"]=57,
   },
-- Table: {12}
   {
      ["Pitch"]=58,
      ["Idx"]=69,
   },
-- Table: {13}
   {
      ["Pitch"]=63,
      ["Idx"]=59,
   },
-- Table: {14}
   {
      ["Pitch"]=52,
      ["Idx"]=60,
   },
-- Table: {15}
   {
      ["Pitch"]=52,
      ["Idx"]=61,
   },
-- Table: {16}
   {
      ["Pitch"]=63,
      ["Idx"]=62,
   },
-- Table: {17}
   {
      ["Pitch"]=63,
      ["Idx"]=68,
   },
}

我需要按顺序排列表，因此如果我这样做

for 1 = 1, 15 do
  note = sel_notes[i].Pitch
  index = sel_notes[i].Idx
  print(note,index)
end

我将得到这个：

52 55
52 60
52 61
52 65
52 67
58 56
58 58
58 63
58 66
58 69
63 57
63 59
63 62
63 64
63 68

然后我就能够改变音符的音高值，使它们与另一个具有和弦音符的表匹配。 因此： 将音高52更改为55 将音高58更改为59 将音高63更改为62