怎么用公式生成如:ABCDEF..........这样的字母序号?
MAPARRAY(range(1, $mynum), if(item <= 26, char(item + 64), CONCATENATE(char(ROUNDUP(item / 26, 0) - 1 + 64), char(if(mod(item, 26) = 0, 26, mod(item, 26)) + 64))))