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concat_ws(合并时的分隔符,合并字段1,字段2。。。)
collect_set(字段):根据某个字段分组后,把分在一组的数据合并在一起,默认分隔符','
eg:
- select jzad,os_type,concat_ws(',',collect_set(host))
- from
- (select jzad,os_type,host,count(*),row_number() over(partition by jzad,os_type order by cast(count(*) as int) desc) rank
- from fengshang_1387ad_top10host_zqm group by jzad,os_type,host
- ) a where rank<=10
- group by jzad,os_type
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