prova questo (sintassi di SQL Server 2005):
DECLARE @YourTable table (col1 varchar(5)
,col2 int
,col3 datetime
,col4 char(3)
)
insert into @YourTable values ('abcdf',123,'1/1/2009','aaa')
insert into @YourTable values ('aaaaa',456,'1/2/2009','bbb')
insert into @YourTable values ('bbbbb',789,'1/3/2009','aaa')
insert into @YourTable values ('ccccc',789,'1/4/2009','bbb')
insert into @YourTable values ('aaaaa',789,'1/5/2009','aaa')
insert into @YourTable values ('abcdf',789,'1/6/2009','aaa')
;with RankedYourTable AS
(
SELECT
ROW_NUMBER() OVER(PARTITION by col1 order by col1) AS col1Rank
,ROW_NUMBER() OVER(PARTITION by col2 order by col2) AS col2Rank
,ROW_NUMBER() OVER(PARTITION by col3 order by col3) AS col3Rank
,ROW_NUMBER() OVER(PARTITION by col4 order by col4) AS col4Rank
FROM @YourTable
)
SELECT
SUM(CASE WHEN col1Rank=1 THEN 1 ELSE 0 END) AS col1DistinctCount
,SUM(CASE WHEN col2Rank=1 THEN 1 ELSE 0 END) AS col2DistinctCount
,SUM(CASE WHEN col3Rank=1 THEN 1 ELSE 0 END) AS col3DistinctCount
,SUM(CASE WHEN col4Rank=1 THEN 1 ELSE 0 END) AS col4DistinctCount
FROM RankedYourTable
USCITA:
col1DistinctCount col2DistinctCount col3DistinctCount col4DistinctCount
----------------- ----------------- ----------------- -----------------
4 3 6 2
(1 row(s) affected)
