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https://issues.apache.org/jira/browse/DERBY-3066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12526876
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Bryan Pendleton commented on DERBY-3066:
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I agree, this is a duplicate of DERBY-84.
Furthermore, I agree with Jack Klebanoff's comment in DERBY-84 that this is not
a bug (https://issues.apache.org/jira/browse/DERBY-84#action_66872).
W.R.T. DERBY-2998, I think that the nested select construction of row_number()
restrictions is the form that should be used.
> WHERE clause not accepted on derived expression columns
> -------------------------------------------------------
>
> Key: DERBY-3066
> URL: https://issues.apache.org/jira/browse/DERBY-3066
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Thomas Nielsen
> Priority: Minor
>
> A very simple query involving an expression column with a derived name in the
> WHERE clause fails:
> ij> select a+b as s from t where s > 2;
> ERROR 42X04: Column 'S' is either not in any table in the FROM list or
> appears within a join specification and is outside the scope of the join
> specification or appears in a HAVING clause and is not in the GROUP BY list.
> If this is a CREATE or ALTER TABLE statement then 'S' is not a column in the
> target table.
> Noticed this while working on DERBY-2998, and AFAIK this is a valid query and
> a limitation in derby.
> There is a workaround for this using a nested select (output from a test
> table):
> ij> select * from (select a+b as s from t) as t(s) where s > 2;
> S
> -----------
> 10
> 10
> 10
> 3 rows selected
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