From: | Pavel Luzanov <p(dot)luzanov(at)postgrespro(dot)ru> |
---|---|
To: | pgsql-docs(at)lists(dot)postgresql(dot)org |
Subject: | Re: Некорректное пояснение к примеру в разделе 13.2.1 |
Date: | 2018-06-27 10:01:03 |
Message-ID: | 4b95bfe2-e1e3-0716-4b10-907c3f80e549@postgrespro.ru |
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Thread: | |
Lists: | pgsql-docs |
Hello,
First of all, this english language forum.
For questions in Russian you can use
pgsql-ru-general(at)lists(dot)postgresql(dot)org list or may be postgres.ru site.
As for your question.
> /BEGIN; /
> /UPDATE website SET hits = hits + 1; /
> /DELETE FROM website WHERE hits = 10; /
> /COMMIT;/
In this example you forget a main part.
DELETE statement must be run in a second session, after UPDATE in first
session, but before COMMIT.
Look carefully in a documentation:
BEGIN;
UPDATE website SET hits = hits + 1;
-- run from another session: DELETE FROM website WHERE hits = 10;
COMMIT;
So, example is correct.
-----
Pavel Luzanov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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