题解 | #修复串列了的记录#
修复串列了的记录
http://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 difficulty = "";
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