Query below returns the average number of columns per table in a database.

Query

select columns,
    tables,
    cast(1.0 * columns / tables as decimal (14,2)) as average_column_count
from
    (select count(*) as columns,
            count(distinct t.table_schema || '.' ||  t.table_name) as tables
      from information_schema.tables t
      inner join information_schema.columns c on 
                 c.table_schema = t.table_schema 
                 and c.table_name = t.table_name
      where t.table_type = 'BASE TABLE'
    );

Columns

• columns - total number of columns in a database
• tables - number of tables in a database
• average_column_count - average number of columns in a table in a database

Rows

• Query returns just one row

Sample results