Question

Given the following table structure:

CrimeID | No_Of_Crimes  |   CrimeDate    | Violence | Robbery | ASB

1            1             22/02/2011         Y          Y      N

2            3             18/02/2011         Y          N      N

3            3             23/02/2011         N          N      Y

4            2             16/02/2011         N          N      Y

5            1             17/02/2011         N          N      Y

Is there a chance of producing a result set that looks like this with T-SQL?

Category   |  This Week |  Last Week
Violence          1           3
Robbery           1           0
ASB               3           1

Where last week shuld be a data less than ’20/02/2011′ and this week should be greater than or equal to ’20/02/2011′

I’m not looking for someone to code this out for me, though a code snippet would be handy :), just some advice on whether this is possible, and how i should go about it with SQL Server.

For info, i’m currently performing all this aggregation using LINQ on the web server, but this requires 19MB being sent over the network every time this request is made. (The table has lots of categories, and > 150,000 rows). I want to make the DB do all the work and only send a small amount of data over the network

Many thanks

Answer 1

EDIT removed incorrect sql for clarity
EDIT Forget the above try the below

select * 
from (
select wk, crime, SUM(number) number
from (
    select case when datepart(week, crimedate) = datepart(week, GETDATE()) then 'This Week'
            when datepart(week, crimedate) = datepart(week, GETDATE())-1 then 'Last Week'
            else 'OLDER' end as wk, 
            crimedate, 
            case when violence ='Y' then no_of_crimes else 0 end as violence, 
            case when robbery ='Y' then no_of_crimes else 0 end as robbery, 
            case when asb ='Y' then no_of_crimes else 0 end as asb 
    from crimetable) as src
UNPIVOT
    (number for crime in 
    (violence, robbery, asb)) as pivtab
group by wk, crime
) z
PIVOT
( sum(number)
for wk in ([This Week], [Last Week])
) as pivtab