mysql分組查詢并排序 sql如何實現(xiàn)分組并select出每組前10個？
sql如何實現(xiàn)分組并select出每組前10個？select m， nfrom ( select row_number () over (partition by m order by n de
sql如何實現(xiàn)分組并select出每組前10個？
select m， nfrom ( select row_number () over (partition by m order by n desc) rn，--以m分組，分組內(nèi)以n倒序排列求每組中各自的序號 m， n from table where ...) wwhere w.rn <=10序號小于10order by m， n desc