declare @str varchar(10)
set @str=''
if exists (select 1 from B where id in(select top 10 id from A))
begin
set @str='tbl_A'
if exists (select 1 from C where id in(select top 10 id from A))
BEGIN 
  set @str=@str+'tbl_B'
  if exists (select 1 from D where id in(select top 10 id from A))
  begin
  set @str=@str+'tbl_D'
  end
END
print '匹配到的表为：'+@str
end


--try

------解决方案--------------------

SQL code
select a.*,if(b.aid is not null,'B',if(c.aid is not null,'C','D')) as tableName
from a
left join b on a.id=b.aid
left join c on a.id=c.aid
left join d on a.id=d.aid
order by a.id 
limit 10;