SAS ADVANCE 63 题的一道看晕头的题疑问-经管之家官网！

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Given the following SAS data sets:
WORK.VISIT1 WORK.VISIT2
Id Expense Id Cost
— ——- — —-
001 500 001 300
001 400 002 600
003 350
The following result set was summarized and
consolidated using the SQL procedure:

Id Cost
— —-
001 300
001 900
002 600
003 350
Which of the following SQL statements was
most likely used to generate this result?
A.
select
Id,
sum(Expense) label=’COST’
from WORK.VISIT1
group by 1
union all
select
Id,
sum(Cost)
from WORK.VISIT2
group by 1
order by 1,2
;
B.
select
id,
sum(expense) as COST
from
WORK.VISIT1(rename=(Expense=Cost)),
WORK.VISIT2
where VISIT1.Id=VISIT2.Id
group by Id
order by
Id,
Cost
;
C.
select
VISIT1.Id,
sum(Cost) as Cost
from
WORK.VISIT1(rename=(Expense=Cost)),
WORK.VISIT2
where VISIT1.Id=VISIT2.Id
group by Id
order by
Id,
Cost
;
D.
select
Id,
sum(Expense) as Cost
from WORK.VISIT1
group by Id
outer union corr
select
Id,
sum(Cost)
from WORK.VISIT2
group by Id
order by 1,2

大牛们, 有的选a, 有的选d.正确答案应该是什么?

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