我有一个表 session 如下:
sessionid conversationid agentid
SES153130074572578571 001a60f3-d95c-4434-a8c0-fabb7d815277_OD112807172056802000 igs.399760
SES15313020119321989 001a60f3-d95c-4434-a8c0-fabb7d815277_OD112807172056802000 hgs.20073
SES153130276854998136 001a60f3-d95c-4434-a8c0-fabb7d815277_OD112807172056802000 igs.100000000308235
SES153128080803552749 00803e49-0325-4bef-b133-8c5e97f2fccc_OD112706138643350000 hgs.20031
SES153128342589414965 00803e49-0325-4bef-b133-8c5e97f2fccc_OD112706138643350000 hgs.20031
SES153129466185930775 008bba3a-98fa-414a-8f99-96956513bc66_OD112757403158502000 igs.401836
SES153129612178429544 008bba3a-98fa-414a-8f99-96956513bc66_OD112757403158502000 hgs.20076
SES153129179161527928 00976601-aac7-4ec7-9e03-61cd59875650_Payment Related Queries hgs.20071
SES153129238786010778 00976601-aac7-4ec7-9e03-61cd59875650_Payment Related Queries igs.100000000307102
我想要其中一个conversationid仅分配给一个代理id的行(将省略一个conversationid分配给多个代理id的情况) 即我的输出应如下所示:
sessionid conversationid agentid
SES153128080803552749 00803e49-0325-4bef-b133-8c5e97f2fccc_OD112706138643350000 hgs.20031
SES153128342589414965 00803e49-0325-4bef-b133-8c5e97f2fccc_OD112706138643350000 hgs.20031
请帮忙解答
最佳答案
select sessionid,agentid,conversationid from session as S
inner join
(
select agentid from session
group by agentid
having count(*)=1
) T
on S.agentid=T.agentid
关于Mysql 自连接用于独特的组合，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51321828/