Get column name length distribution in Db2 database

Query below returns distribution of column name lengths (number of characters).

Query

select length(c.colname) as column_name_length,
       count(*) as columns,
       count(distinct c.tabschema concat '.' concat c.tabname) as tables 
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%'
group by length(c.colname)
order by length(c.colname);

Columns

  • column_name_length - lenght in characters of column name
  • columns - number of columns with this length
  • tables - number of tables that have columns with this name length

Rows

  • One row represents one name lenght (number of characters)
  • Scope of rows: each column length that exists in a database
  • Ordered by length ascending (from 1 to max)

Sample results

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