好吧，如果您不能在一个查询中完成全部操作，则可以将两个查询简单地连接在一起:

Well, if you cannot do it all in one query, then you can simply join the 2 queries together:

select
t1.region,
t1.model,
t1.uniques,
t2.sales
from
(select CAST(LEFT(b.name, 3) AS varchar(3))AS Region, a.model, sum(a.Number)AS Uniques
from Table1 a
inner join database2.....table2 b
on a.code = b.code
where Year(a.EventDate) = @year
and Month(a.EventDate) = @month
and a.make='Toyota'
group by CAST(LEFT(b.name, 3) AS varchar(3)), a.model
order by CAST(LEFT(b.name, 3) AS varchar(3))
) t1 
inner join
(
select CAST(LEFT(c.name, 3) AS varchar(3)) AS Region, a.Model, sum(b.Number)As Sales
from Table1 a
left join Table3 b
on a.leadid = b.leadid
inner join Database1..Table2 c
on a.code = c.code
where Year(a.EventDate) = @year
and Month(a.EventDate) = @month
and a.make='Toyota'
group by a.Model, CAST(LEFT(c.Name, 3) AS varchar(3))
order by CAST(LEFT(c.Name, 3) AS varchar(3))
) t2
on t1.region = t2.region 
and t1.model = t2.model