Re: Are there performance advantages in storing bulky field in separate table?

Поиск
Список
Период
Сортировка
От Thomas Kellerer
Тема Re: Are there performance advantages in storing bulky field in separate table?
Дата
Msg-id grj82q$u4s$1@ger.gmane.org
обсуждение исходный текст
Ответ на Re: Are there performance advantages in storing bulky field in separate table?  (Robert Treat <xzilla@users.sourceforge.net>)
Список pgsql-general
Robert Treat wrote on 08.04.2009 23:06:

> http://www.databasedesign-resource.com/null-values-in-a-database.html

That is a very - hmm - strange article.

One of the proofs that nulls are bad is that "SELECT * FROM theTable" (theTable
being empty) returns nothing, whereas SELECT COUNT(*) FROM theTable returns a
single row with 0 (zero):

"This last example is even worse: The SELECT * returns 'No rows selected', but
the SELECT COUNT(*) returns ONE row with the value 0!"

I stopped reading the article at that point...

В списке pgsql-general по дате отправления:

Предыдущее
От: Sam Mason
Дата:
Сообщение: Re: Are there performance advantages in storing bulky field in separate table?
Следующее
От: Ron Mayer
Дата:
Сообщение: Re: Are there performance advantages in storing bulky field in separate table?