On 4/3/2012 8:00 AM, Birgitta Hauser wrote:
select client, min(childAge) as youngest, max(childAge) as eldest
from table group by client
having youngest< 20 and eldest> 20
This is nearly right, except correlation names or names for temporary
columns are NOT allowed within the same sub-select, i.e. youngest and eldest
cannot be used in the having clause.
Select Client, Min(ChildAge), Max(ChildAge)
> From Table
Group by Client
Having Min(ChildAge)< 20 and Max(ChildAge)> 20



Yes, of course, Birgitta. Thanks for taking the time to point that out. Something didn't look quite right, but I couldn't put my finger on it.

This is one of the things I wish could be fixed in SQL. I'm not sure why it's such a problem, but the restriction really makes it difficult to do complex grouping calculations. You basically have to type the exact same logic twice, which provides an opportunity for typos (something I'm VERY good at).

Joe

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2019 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].