The non-working code in your example should be
select count(*)
from (select distinct ename,job from emp)
/
It appears that cound takes only one parameter ... not two.
Raj
______________________________________________________
Rajendra Jamadagni MIS, ESPN Inc.
Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.
QOTD: Any clod can have facts, but having an opinion is an art!
-----Original Message-----
From: Charu Joshi [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 29, 2003 1:19 PM
To: Multiple recipients of list ORACLE-L
Subject: SQL question
Hello Listers,
How to find out the COUNT of DISTINCT values of multiple columns?
For eg.
SQL> SELECT DISTINCT ename FROM emp;
-- This works.
SQL> SELECT COUNT(DISTINCT ename) FROM emp;
-- So does this.
SQL> SELECT DISTINCT ename, job FROM emp;
-- And this too.
SQL> SELECT COUNT(DISTINCT ename, job) FROM emp;
-- So why does this fail?
I can do a COUNT(DISTINCT ename || job), but that doesn't seem to be elegant
way of doing it.
I have a feeling I might be missing some fairly basic syntax, but feeling
dumb is better than suspense.
Thanks & regards,
Charu.
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