题解|拆分| #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,
CAST( substring_index(tag, ',', -1) AS DECIMAL ) AS duration
FROM examination_info
WHERE tag LIKE '%,%';
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