我要评论语法：
select 列名, length(列名)
from 表名
where
length(列名) = ( select max(length(列名)) from 表名);
实例：
select project_num, length(project_num)
from project_infor_table
where
length(project_num) = ( select max(length(project_num)) from project_infor_table);
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