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  3. April 2012

Re: AW: Sql muddle

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

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