count # of unioned values

[Joe Powell]

Suppose I have a table with 2 VARCHAR2(1)colu mns C1 and C2 and the
following 3 rows:
A B
A C
B A

For each value in columns C1 and/or C2, I need to report the count of
that value in each column such as:

Value #C1s #C2s
----- ----- -----
A 2 1
B 1 1
C 0 1
----- ----- -----
Total 3 3

I have written a PL/SQL procedure to do this. With Oracle 9.2 what is
the best method to do this with a single SQL query?

[Conan]

Re: count # of unioned values

Hi Joe,
this should work

compute sum label total of out1 out2 on report
break on report

SELECT COL, SUM(C1) as #1,SUM(C2) as #2
FROM
(SELECT COL1 AS COL,COUNT (*) AS C1,0 AS C2
FROM TEST
GROUP BY COL1
UNION
SELECT COL2 AS COL,0 AS C1,COUNT (*) AS C2
FROM TEST
GROUP BY COL2)
GROUP BY COL
/

HTH
Conan

Joe Powell wrote in message ...

>Suppose I have a table with 2 VARCHAR2(1)colu mns C1 and C2 and the
>following 3 rows:
>A B
>A C
>B A
>
>For each value in columns C1 and/or C2, I need to report the count of
>that value in each column such as:
>
>Value #C1s #C2s
>----- ----- -----
>A 2 1
>B 1 1
>C 0 1
>----- ----- -----
>Total 3 3
>
>I have written a PL/SQL procedure to do this. With Oracle 9.2 what is
>the best method to do this with a single SQL query?

[kibeha]

Re: count # of unioned values

joe.powell@lmco .com (Joe Powell) wrote in message news:<deea9325. 0402041357.3037 f269@posting.go ogle.com>...

For each value in columns C1 and/or C2, I need to report the count of
that value in each column such as:
>
Value #C1s #C2s
----- ----- -----
A 2 1
B 1 1
C 0 1
----- ----- -----
Total 3 3

This should do it :

select
value,
sum(decode(col, 'C1',cnt,0)) cnt_c1,
sum(decode(col, 'C2',cnt,0)) cnt_c2
from
(
select 'C1' col, c1 value, count(*) cnt
from table1 group by c1
union all
select 'C2' col, c2 value, count(*) cnt
from table1 group by c2
) s1
group by value


KiBeHa