A valid column name must begin with a letter, be less than or equal to 30 characters, and consist of only alphanumeric characters and the special characters $, _, and #.
A valid column name must begin with a letter, be less than or equal to 30 characters, and consist of only alphanumeric characters and the special characters $, _, and #.
一个有效的列名必须是以字母开头，小于30个字符，并且只包含字母、数字或一些特殊的符号$,_,#。