【记一次微信小程序云开发联表聚合查询，包括表联接、分组统计等实现】

open_idnamehead_url1张三http://www.xxx.com/img12李四http://www.xxx.com/img23王五http://www.xxx.com/img3

open_idstep_numscreate_time1111120xx/xx/xx1222220xx/xx/xx2333320xx/xx/xx

open_idfans_idcreate_time1220xx/xx/xx1320xx/xx/xx2320xx/xx/xx

open_idnamehead_urlstepsthumbs_num1张三http://www.xxx.com/img1333322李四http://www.xxx.com/img2333313王五http://www.xxx.com/img300

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