题解 | #修复串列了的记录#
修复串列了的记录
https://www.nowcoder.com/practice/a5475ed3b5ab4de58e2ea426b4b2db76
select
exam_id,
substring_index(tag,',',1) as tag,
substring_index(substring_index(tag,',',2),',',-1) as difficulty,
substring_index(tag,',',-1) as duration
from examination_info
where length(tag) > 10