WHERE clause not accepted on derived expression columns
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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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