Re: [GENERAL] Function to return per-column counts?

Поиск
Список
Период
Сортировка
От Seamus Abshere
Тема Re: [GENERAL] Function to return per-column counts?
Дата
Msg-id 1506627083.7890.1121668992.54ADF7AE@webmail.messagingengine.com
обсуждение исходный текст
Ответ на Re: [GENERAL] Function to return per-column counts?  (John McKown <john.archie.mckown@gmail.com>)
Ответы Re: [GENERAL] Function to return per-column counts?  (Melvin Davidson <melvin6925@gmail.com>)
Список pgsql-general
> > > Does anybody have a function lying around (preferably pl/pgsql) that
> > > takes a table name and returns coverage counts?
> >
> > What is "coverage count"?

Ah, I should have explained better. I meant how much of a column is
null.

Basically you have to

0. count how many total records in a table
1. discover the column names in a table
2. for each column name, count how many nulls and subtract from total
count

If nobody has one written, I'll write one and blog it.

Thanks!
Seamus

PS. In a similar vein, we published
http://blog.faraday.io/how-to-do-histograms-in-postgresql/ which gives
plpsql so you can do:

SELECT * FROM histogram($table_name_or_subquery, $column_name)

--
Seamus Abshere, SCEA
https://www.faraday.io
https://github.com/seamusabshere
https://linkedin.com/in/seamusabshere


-- 
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general

В списке pgsql-general по дате отправления:

Предыдущее
От: John McKown
Дата:
Сообщение: Re: [GENERAL] Function to return per-column counts?
Следующее
От: Melvin Davidson
Дата:
Сообщение: Re: [GENERAL] Function to return per-column counts?