mysql炸裂函数的实现 [数据库教程]

database

 

SELECT

substring_index(substring_index(a.chain,_,b.help_topic_id +1 ), _ ,-1 ) AS ID

FROM

(select1_11_1223_1242as chain) a

JOIN mysql.help_topic b ON b.help_topic_id <

(length(a.chain) - length( replace(a.chain, _, ‘‘) ) +1)

 

 

mysql-炸裂函数的实现

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