SQL比较查询错误

Question

I have a table with transaction history for 3 years, I need to compare the sum ( transaction) for 12 months with sum( transaction) for 4 weeks and display the customer list with the result set.

Table Transaction_History

Customer_List  Transaction   Date
1                  200     01/01/2014
2                  200     01/01/2014
1                  100     10/24/2014
1                  100     11/01/2014
2                  200     11/01/2014

The output should have only Customer_List with 1 because sum of 12 months transactions equals sum of 1 month transaction.

I am confused about how to find the sum for 12 months and then compare with same table sum for 4 weeks.

Answer 1

the query below will work, except your sample data doesnt make sense

total for customer 1 for the last 12 months in your data set = 400 total for customer 1 for the last 4 weeks in your data set = 200

unless you want to exclude the last 4 weeks, and not be a part of the last 12 months?

then you would change the "having clause" to:

having
sum(case when Dt >= '01/01/2014' and dt <='12/31/2014' then (trans) end) - sum(case when Dt >= '10/01/2014' and dt <= '11/02/2014' then (trans) end) = 
    sum(case when Dt >= '10/01/2014' and dt <= '11/02/2014' then (trans) end)

of course doing this would mean your results would be customer 1 and 2

 create table #trans_hist
(Customer_List int, Trans int, Dt Date)

insert into #trans_hist (Customer_List, Trans , Dt ) values 
(1,                  200,     '01/01/2014'),
(2,                  200,     '01/01/2014'),
(1,                  100,     '10/24/2014'),
(1,                  100,     '11/01/2014'),
(2,                  200,     '11/01/2014')

select 

Customer_List




from #trans_hist

group by 
Customer_List


having
sum(case when Dt >= '01/01/2014' and dt <='12/31/2014' then (trans) end) = 
    sum(case when Dt >= '10/01/2014' and dt <= '11/02/2014' then (trans) end)





drop table #trans_hist

Answer 2

I suggest a self join.

select yourfields
from yourtable twelvemonths join yourtable fourweeks on something
where fourweek.something is within a four week period
and twelvemonths.something is within a 12 month period

You should be able to work out the details.

Answer 3

If your transactions are always positive and you want customers whose 12-month totals equal the 4-week total, then you want customers who have transactions in the past four weeks but not in the preceding 12 months - 4 weeks.

You can get this more directly using aggregation and a having clause. The logic is to check for any transactions in the past year that occurred before the previous 4 weeks:

select Customer_List
from Transaction_History
where date >= dateadd(month, -12, getdate())
group by CustomerList
having min(date) >= dateadd(day, -4 * 7, getdate());

Answer 4

Look here for methods to aggregate by month, year, etc.

http://weblogs.sqlteam.com/jeffs/archive/2007/09/10/group-by-month-sql.aspx