Re: ambiguous column names in subqueries

Поиск
Список
Период
Сортировка
От Greg Stark
Тема Re: ambiguous column names in subqueries
Дата
Msg-id 87u0ro3z71.fsf@stark.xeocode.com
обсуждение исходный текст
Ответ на Re: ambiguous column names in subqueries  (Oliver Jowett <oliver@opencloud.com>)
Список pgsql-hackers
Oliver Jowett <oliver@opencloud.com> writes:

> Please don't. JDBC (for example) has no problem with ambiguous columns, you
> just access them by index, and you have resultset metadata available if you
> want to implement your own rules for finding those indexes. It sounds like your
> problem really lies in the API you are using to access the results.

The API with the problem is the SQL language. It's there that the columns
become inaccessible. It seems silly for the language to let you create
variables that you can't reference. 

Yes it's true that you could access them from the result set but that's even
worse. You have variables that you can't access from within the language but
that can escape to the outside world to cause real effects.

-- 
greg



В списке pgsql-hackers по дате отправления:

Предыдущее
От: Tom Lane
Дата:
Сообщение: Re: split_part bug
Следующее
От: Greg Stark
Дата:
Сообщение: Re: ambiguous column names in subqueries