Oracle-L: SQL question

From: Charu Joshi <joshic_at_mahindrabt.com>
Date: Wed, 29 Jan 2003 10:19:15 -0800
Message-ID: <F001.0053D836.20030129101915@fatcity.com>

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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Author: Charu Joshi
INET: joshic_at_mahindrabt.com

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