Query returns basic statistics of numbers of columns 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'
) q

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