Question

I have a mock up of a sql query that will represent a real sql query.

Create table #tmp (     Atype varchar(10),     Btype varchar(10) )  insert into #tmp values ('a','x') insert into #tmp values ('b','x') insert into #tmp values ('a','y') insert into #tmp values ('a','y') insert into #tmp values ('b','z') insert into #tmp values ('b','y')  select atype, btype,count(*) as count from #tmp group by atype, btype order by atype  drop table #tmp 

This will give me the result of:

atype btype count ----------------- a     x     1 a     y     2 b     x     1 b     y     1 b     z     1 

What i am looking for after this is to be able to create a report that basically looks like:

atype|x| y| z ------------- a    |1| 2| 0 b    |1| 1| 1 

I am sure you can do this using come crazy t-sql code but i am struggeling to get it right.

EDIT:

I agree that you can use the TSQL PIVOT command but what happens when Btype is variable. Meaning that i dont know how many types there will be?

Answer 1

SELECT   atype,    SUM(CASE btype WHEN 'x' THEN 1 ELSE 0 END) AS x,   SUM(CASE btype WHEN 'y' THEN 1 ELSE 0 END) AS y,   SUM(CASE btype WHEN 'z' THEN 1 ELSE 0 END) AS z FROM   #tmp group by    atype order by    atype