sql - MySQL: Combine union and top 3 count of leads -


i'm trying obtain each campaign type , 3 lead names have (top 3) attendances each campaign type. should looks this: 

+-------+-----------+ | code  |  leadname |      +-------+-----------+ | wp    | lead    |     | wp    | lead b    |    | wp    | lead c    |    | cf    | lead b    |     | cf    | lead c    |    | cf    | lead    |   | tl    | lead b    |     | tl    | lead    |    | tl    | lead c    |     campaign table: campaignid, campaignname, campaignstartdate, code campaign members table:campaignid, leadid, campaignmemberstatus, campaignmembersignupdate leads table: leadid, leadname, accountid

campaignid links campaign --> members, leadid links members --> leads i'm struggling on how union , provide top 3 leadnames. 

select top 3 abc.code,abc.leadname   ( select a.code,c.leadname,count(*) total  campaign left join [campaign members] b on b.campaignid = a.campaignid left join leads c on c.leadid = b.leadid group a.code, c.leadname order count(*)  ) abc

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