Suppose I'm doing a group by query like the following:
SELECT drug1, drug2, AVG(response)
FROM data
GROUP BY drug1, drug2
The problem is that the same drug may appear sometimes as drug1 and sometimes
as drug2. So, for example, the combination aspirin, acetaminophen may also
appear as
On Wed, Jan 19, 2011 at 03:37:58PM -0500, Aram Fingal wrote:
Suppose I'm doing a group by query like the following:
SELECT drug1, drug2, AVG(response)
FROM data
GROUP BY drug1, drug2
The problem is that the same drug may appear sometimes as drug1 and
sometimes as drug2. So, for example,
Aram Fingal fin...@multifactorial.com writes:
Suppose I'm doing a group by query like the following:
SELECT drug1, drug2, AVG(response)
FROM data
GROUP BY drug1, drug2
The problem is that the same drug may appear sometimes as drug1 and sometimes
as drug2. So, for example, the combination
Easy way is something like
SELECT LEAST(drug1, drug2), GREATEST(drug1, drug2), AVG(response)
FROM data
GROUP BY 1, 2
though it'd be a PITA to scale that to more than 2 drugs.
regards, tom lane
Thanks, Tom and Hubert, who said the same thing. For the foreseeable
