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Home > Forums > Programmers > Languages > ANSI_SQL Forum

Can this be done?Helpful Member! 

thread220-1566871
Read More Threads Like This One
Laeg (Programmer)
29 Aug 09 10:16
I have a table of CartItems, with the ProductID bought and then an Extra field which is true or false. I want to see a grouping of a count of each ProductID but within that count I want to know the count of ProductIDs with extras.

So given

CODE

create table test(CartItemID int, ProductID int, Extra int);

insert into test (CartItemID, ProductID, Extra) values (100, 1, 1);
insert into test (CartItemID, ProductID, Extra) values (200, 2, 0);
insert into test (CartItemID, ProductID, Extra) values (300, 2, 0);
insert into test (CartItemID, ProductID, Extra) values (400, 1, 1);

select ProductID, count(ProductID) as Total
from test
group by ProductID;

produces...

ProductID | Total
 1                  2
 2                  2

I'd like it to say ...

ProductID | Total | ExtraCount
 1                    2       2             <-- True As 2 instances of a ProductID 1 purchase also had Extra (CartItemID 100, 400)
 2                    2       0             <-- False As 0 instances of a ProductID 2 purchase had Extra

Can this be done?

Thanks for replies
 
Helpful Member!  r937 (TechnicalUser)
29 Aug 09 10:39

CODE

SELECT ProductID
     , COUNT(*) AS Total
     , COUNT(CASE WHEN Extra = 1
                  THEN 'Science!!'
                  ELSE NULL END) AS ExtraCount
  FROM CartItems
GROUP
    BY ProductID
smile

r937.com | rudy.ca
Buy my new book Simply SQL from Amazon

Laeg (Programmer)
29 Aug 09 11:21
Cheers! Now if only you could translate that into .NET Linq it'd make my day week!
r937 (TechnicalUser)
29 Aug 09 11:32
perhaps you should ask that question in the .NET forum, eh

winky smile

r937.com | rudy.ca
Buy my new book Simply SQL from Amazon

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