标签：highlight mys sdn length _id blog com bsp png
mysql.help_topic
利用help_topic表把以逗号分隔的字符串转换成行。
SELECT
substring_index(substring_index( a.rn,‘,‘,b.help_topic_id + 1 ),‘,‘ ,- 1) AS rn
FROM
(select ‘1,2,3,4‘ as rn) a
JOIN mysql.help_topic b ON b.help_topic_id <
(length(a.rn) - length( replace(a.rn, ‘,‘, ‘‘) ) + 1)
效果如下
详细实现思路可以看下这个https://blog.csdn.net/zhxdick/article/details/105531916
标签：highlight mys sdn length _id blog com bsp png
原文地址：https://www.cnblogs.com/imnet/p/14297881.html
