This query returns columns in a database sorted by their name.

Query

select c.colname as column_name,
    length(c.colname) as column_name_length,
    c.tabschema as schema_name,
    c.tabname as table_name
from syscat.columns c
inner join syscat.tables t on 
      t.tabschema = c.tabschema and t.tabname = c.tabname
where t.type = 'T'
and t.tabschema not like 'SYS%'
order by column_name_length desc, 
    column_name;

Columns

• column_name - column name
• column_name_length - column name length
• schema_name - column table schema name
• table_name - column table name

Rows

• One row represents one column of each table in a database
• Scope of rows: each column that exists in a database
• Ordered by length descrending - from longhest to shortest

Sample results