How to write joint query?

let's say i have a one table called order which contains productid, now how do i write the query which counts the number of orders which contains only two product (Ex Product A and Product B).
i try by writing one query which display product A and then second query which display product b and then i join two gather it works fine but how do i write everything in one query instead of three query.
bcp5190Asked:
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rscott_youngConnect With a Mentor Commented:
Because you can't use "SUM" in your WHERE clause you'll have to use two queries.  Below is an example of both.  Use the first query to create a temporary table and the second to select your orders:

SELECT max([Order ID]),
sum(iif([Product ID] = 'A',1,0)) as PRODUCTA,
sum(iif([Product ID] = 'B',1,0)) as PRODUCTB,
sum(iif([Product ID] <> 'A' and [Product ID] <> 'B',1,0)) AS NONAB
FROM [Orders Detail]
GROUP BY [Order ID];

SELECT Order ID
FROM Temptable
WHERE PRODUCTA > 0 and PRODUCTB > 0 and NONAB = 0
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