Question

I have a SQL Server 2005 table which lists customers and their order lines like this…

Cust  | Code 
Cust1   N001
Cust2   N001
Cust2   N003
Cust2   N004
Cust3   N001
Cust3   N002
Cust3   N003
Cust3   N004

I need the results to list each customer (Once) and whether they have ordered ANY items between N002 and N004. The results would therefore look like this…

Cust  | Ordered?
Cust1   False
Cust2   True
Cust3   True

I have tried various combinations of All / ANY etc. The closest I got was using two queries. In the first I would add the following to get a true/false statement to the end of each line …

SELECT 
    Cust, Code, 
    CASE 
        WHEN Code BETWEEN 'N002' AND 'N004' THEN 'True' 
        ELSE 'False' 
    END AS Expr1 

This gives the following…

Cust  | Code | EXPR1
Cust1   N001   FALSE
Cust2   N001   FALSE
Cust2   N003   TRUE
Cust2   N004   TRUE
Cust3   N001   FALSE
Cust3   N002   TRUE
Cust3   N003   TRUE
Cust3   N004   TRUE

Then using a second query and grouping the results I get

Cust  | Ordered?
Cust1   False
Cust2   False
Cust2   True
Cust3   False
Cust3   True

So could any one help to achieve simply…

Cust  | Ordered?
Cust1   False
Cust2   True
Cust3   True

Answer 1

My solution is to add a variable specifying whether the value is in range, and then checking that in the case statement:

SELECT Cust,
       (case when sum(inrange) > 0 THEN 'True' ELSE 'False' END) AS count
from (select t.*,
             (case when code between 'N002' and 'N004' then 1 else 0 end) as inrange
      from t
     ) t
group by cust

You can actually combine the two case statements into one, if you don’t care about the readability of your code.