Fetch data in MS SQL 2008 - sql

Question

I have three tables which are like:
table1
id,
created_Date
table2
id
district_ID
status_ID
table3
district_ID
district_Name
Now i need the records in following format
Srno District_name <10 days >10 and <20 days >20 days
1 xxx 12 15 20
2 yyy 8 0 2
count days as per current date
for example: if the created date is 10-08-2013 and current date is 13-08-2013 the date difference will be 3
So what should my query be? Any suggestions will be appreciated.
Thank you
table1
id created_Date
1 2013-07-12 13:32:10.957
2 2013-07-12 13:32:10.957
3 2013-08-01 10:00:10.957
4 2013-08-10 13:32:10.957
5 2013-08-10 14:32:10.957
table2
id district_ID status_id
1 1 3
2 2 3
3 2 7
4 3 4
5 4 3
table1
district_ID district_Name
1 xxx
2 yyy
3 zzz
4 aaa
5 bbb

Answer 1

I would have a look at using DATEDIFF and CASE.
DATEDIFF (Transact-SQL)
Returns the count (signed integer) of the specified datepart
boundaries crossed between the specified startdate and enddate.
Something like
SELECT District_name,
SUM(
CASE
WHEN DATEDIFF(day,created_Date, getdate()) < 10
THEN 1
ELSE 0
END
) [<10 days],
SUM(
CASE
WHEN DATEDIFF(day,created_Date, getdate()) >= 10 AND DATEDIFF(day,created_Date, getdate()) < 20
THEN 1
ELSE 0
END
) [>10 and <20 days],
SUM(
CASE
WHEN DATEDIFF(day,created_Date, getdate()) >= 20
THEN 1
ELSE 0
END
) [>20 days]
FROM Your_Tables_Here
GROUP BY District_name

Answer 2

;with cte as (
select t3.district_Name, datediff(day, t1.created_Date, getdate()) as diff
from table1 as t1 as t1
inner join table2 as t2 on t2.id = t1.id
inner join table3 as t3 on t3.district_id = t2.district_id
)
select
district_Name,
sum(case when diff < 10 then 1 else 0 end) as [<10 days],
sum(case when diff >= 10 and diff < 20 then 1 else 0 end) as [>=10 and < 20 days],
sum(case when diff >= 20 then 1 else 0 end) as [>= 20 days]
from cte
group by district_Name