Re: Count of non-null values per table column

On Fri, Aug 14, 2015 at 6:35 PM, David Nelson <dnelson77808(at)gmail(dot)com>
wrote:

> On Fri, Aug 14, 2015 at 10:00 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >
> > David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> writes:
>

> Tthat is the way I would do it for a table with a small number of columns,
> but these have several dozen so this would get tedious. Although I just
> realized I could output the list of column names from the pg_stat view to a
> file and whip up some vi find and replace to create the entire statement
> pretty quickly. I was just wondering if that was the only way or not.
>

You could use this to generate the SQL:

\set my_table my_real_table_name

SELECT 'SELECT COUNT(*) AS total_rows, '||array_to_string(array(SELECT
'COUNT('||column_name::text ||') AS ' || column_name::text FROM
information_schema.columns WHERE table_name=:'my_table'),E',\n') || ' FROM
' || :'my_table' || ';';

Cheers,
Ken
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