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select top 2 * from tb where grouptypeid=1 order by adddate desc
select top 2 * from tb where grouptypeid=1 order by adddate desc
union
select top 2 * from tb where grouptypeid=2 order by adddate desc
union
select top 2 * from tb where grouptypeid=3 order by adddate desc
union
select top 2 * from tb where grouptypeid=4 order by adddate desc
union
select top 2 * from tb where grouptypeid=5 order by adddate desc