Re: Get date timestamp(3) without time zone column - PGSQL 9.5

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От	Sameer Kumar
Тема	Re: Get date timestamp(3) without time zone column - PGSQL 9.5
Дата	5 сентября 2016 г. 06:06:24
Msg-id	CADp-Sm51d3B2oSNj5kCAA5_SiQ0HQLoMrshjfO-g2xCzJs7Saw@mail.gmail.com обсуждение исходный текст
Ответ на	Get date timestamp(3) without time zone column - PGSQL 9.5 (Patrick B <patrickbakerbr@gmail.com>)
Ответы	Re: Get date timestamp(3) without time zone column - PGSQL 9.5 (Patrick B <patrickbakerbr@gmail.com>)
Список	pgsql-general

Дерево обсуждения

On Mon, Sep 5, 2016 at 10:59 AM Patrick B <patrickbakerbr@gmail.com> wrote:

Hi guys,

I got the tasks table that has the tasks_start column:
tasks_start | timestamp(3) without time zone

select tasks_start from tasks LIMIT 1;
tasks_start
-------------------
2016-08-10 00:30:00

I'm trying to cast the date, using this query:
SELECT cast(tasks_start as date) FROM "jobs" WHERE "tasks"."deleted" = 'f' AND "tasks"."recurrence_id" = 1 AND (Date(tasks_start) in ('2016-08-10')

You might want to share the version of PostgreSQL you are using.

You might want to try date_trunc and AT TIMEZONE function/operators-

https://www.postgresql.org/docs/9.4/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC

SELECT date_trunc('day', tasks_start at TIME ZONE 'EST')

Note: I have not tried this statement

Is this something you are going to use often? If that is the case then consider to re-model your query. The moment you use an expression on a column it would not use a normal BTree index.