Using a sub query in column list - sql

Question

I would like to create a query that would count how many records were created in the last 7, 14 and 28 days. My result would return something like:
7Days 14Days 28Days
21 35 56
I know how to for each timepsan e.g. 7 days, but I do I capture all three in one query?
select count(*) from Mytable
where Created > DATEADD(day,-8, getdate())

Answer 1

Also not pretty, but doesn't rely on subqueries (table/column names are from AdventureWorks). The case statement returns 1 if it falls within your criteria, 0 otherwise - then you just sum the results :
select sum(case when datediff(day, modifieddate, getdate()) <= 7
then 1 else 0 end) as '7days',
sum(case when datediff(day, modifieddate, getdate()) > 7
and datediff(day, modifieddate, getdate()) <= 14
then 1 else 0 end) as '14days',
sum(case when datediff(day, modifieddate, getdate()) > 14
and datediff(day, modifieddate, getdate()) <= 28
then 1 else 0 end) as '28days'
from sales.salesorderdetail
Edit: Updated the datediff function - the way it was written, it would return a negative number (assuming modifieddate was in the past) causing all items to fall under the first case. Thanks to Andriy M for pointing that out

Answer 2

It isn't the prettiest code in the world, but it does the trick. Try selecting from three subqueries, one for each range.
select * from
(select COUNT(*) as Cnt from Log_UrlRewrites where CreateDate >= DATEADD(day, -7, getdate())) as Seven
inner join (select COUNT(*) as Cnt from Log_UrlRewrites where CreateDate >= DATEADD(day, -14, getdate())) as fourteen on 1 = 1
inner join (select COUNT(*) as Cnt from Log_UrlRewrites where CreateDate >= DATEADD(day, -28, getdate())) as twentyeight on 1 = 1

Answer 3

select
(
select count(*)
from Mytable
where Created > DATEADD(day,-8, getdate())
) as [7Days],
(
select count(*)
from Mytable
where Created > DATEADD(day,-15, getdate())
) as [14Days],
(
select count(*)
from Mytable
where Created > DATEADD(day,-29, getdate())
) as [28Days]

Answer 4

SELECT
[7Days] = COUNT(CASE UtmostRange WHEN 7 THEN 1 END),
[14Days] = COUNT(CASE UtmostRange WHEN 14 THEN 1 END),
[28Days] = COUNT(CASE UtmostRange WHEN 28 THEN 1 END)
FROM (
SELECT
*,
UtmostRange = CASE
WHEN Created > DATEADD(day, -8, GETDATE()) THEN 7
WHEN Created > DATEADD(day, -15, GETDATE()) THEN 14
WHEN Created > DATEADD(day, -29, GETDATE()) THEN 28
END
FROM Mytable
) s