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From "Jack Klebanoff (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-84) Column aliasing could simplify queries
Date Fri, 29 Apr 2005 17:53:04 GMT
     [ http://issues.apache.org/jira/browse/DERBY-84?page=comments#action_64077 ]
Jack Klebanoff commented on DERBY-84:

The problem described by Bob Gibson in the main body of this report and the problem described
by Micah Spears in his comment of 12/Jan/05 seem different to me.

This bug report complains that Derby does _not_ support the use of column aliases in WHERE

The problem described in the 12/Jan/05 comment is that Derby _requires_ the use of column
aliases in an ORDER BY clause for columns that have aliases. The comment complains that Derby
should, but currently does not, allow the original column names in an ORDER BY clause if the
column has an alias. I think that the 12/Jan/05 comment is a duplicate of Derby-127, but this
bug report (Derby-84) is different.

> Column aliasing could simplify queries
> --------------------------------------
>          Key: DERBY-84
>          URL: http://issues.apache.org/jira/browse/DERBY-84
>      Project: Derby
>         Type: New Feature
>   Components: SQL
>     Versions:
>     Reporter: Bob Gibson
>     Priority: Minor

> Currently, one can not use an alias to simplify queries.  For example, being able to
alias "LongDescriptiveColumnName" AS LDCN would allow one to use the alias elsewhere in the
query, e.g., the WHERE clause:
> SELECT LongDescriptiveColumnName AS LDCN FROM MyTable WHERE LDCN LIKE '%testing%';
> The current result is a message like:
> ERROR 42X04: Column 'LDCN' is not in any table in the FROM list or it appears within
a join specification and is outside the scope of the join specification or it appears in a
HAVING clause and is not in the GROUP BY list.  If this is a CREATE or ALTER TABLE statement
then 'LDCN' is not a column in the target table.

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