Question : Building Informix SQL Statements

I have a little problem transfering the SQL Statements which ran under MySQL to the Informix SQL

I already asked a question in

http://www.experts-exchange.com/Databases/Mysql/Q_20662870.html

this worked fine for MySQL however as we do a Benchmark for Databases the Statements are not compatible

In fact when I do the following

SELECT LENGTH(column) AS len, COUNT(*) AS nbr
FROM table
WHERE LENGTH(column) BETWEEN lower AND upper
GROUP BY len
ORDER BY len

the len is not accessible in the Where block or in the Group by , Order by

it says it can't fin the "len"Column

How should I change this to be accessible.

Second Problem:

This statement does not execute, it says Syntax Error:

SELECT Count DISTINCT LENGTH(column) FROM table

However for numeric values this works fine with

Select Count Distinct(column) from table

But for Strings i want to do it over the length of the string not over the contents.

Answer : Building Informix SQL Statements

yes, distinct on columns is also an extension of MySql

little question : WHY are you porting to such a pityful restricted-limited system as Informix ?