拼接SQL语句
select ID,Name from Users as userleft join Admin as ad on user.Id=ad.Idselect ID,C_Name from Group as grouleft join Group as cg on grou.ID=cg.serial
select * from ( select ID,Name from Users as user left join Admin as ad on user.Id=ad.Id) a inner join ( select ID,C_Name from Group as grou left join Group as cg on grou.ID=cg.serial) on a.ID = b.ID
[解决办法]
select * from ( select ID,Name from Users as users left join Admin as ad on users.Id=ad.Id) a inner join ( select ID,C_Name from [Group] as g left join [Group] as cg on g.ID=cg.serial) b on a.ID = b.ID