在平時的工作經常會用到IF函數，但IF函數最多隻能嵌套7層，其實可以使用&來處理7層以上的條件
公式如下：
=IF(A1=1,"A",IF(A1=2,"B",IF(A1=3,"C",IF(A1=4,"D",IF(A1=5,"E",IF(A1=6,"F",IF(A1=7,"G",IF(A1=8,"H",""))))))))&IF(A1=9,"I",IF(A1=10,"J",IF(A1=11,"K",IF(A1=12,"L",IF(A1=13,"M",IF(A1=14,"N",IF(A1=15,"O",IF(A1=16,"P",""))))))))& IF(A1=17,"Q",IF(A1=18,"R",IF(A1=19,"S",IF(A1=20,"T",IF(A1=21,"U",IF(A1=22,"V",IF(A1=23,"W",IF(A1=24,"X",""))))))))&IF(A1=25,"Y",IF(A1=26,"Z",""))