参考链接:https://blog.csdn.net/qq_21101587/article/details/78642423
sel`ect club_prof_id,* from m
left join a on CAST(m.club_prof_id as varchar) = CAST(a.club_id as varchar)
参考链接:https://blog.csdn.net/qq_21101587/article/details/78642423
sel`ect club_prof_id,* from m
left join a on CAST(m.club_prof_id as varchar) = CAST(a.club_id as varchar)