Re: [SQL] datetime query issue

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От tjk@tksoft.com
Тема Re: [SQL] datetime query issue
Дата
Msg-id 199908281823.LAA22218@uno.tksoft.com
обсуждение исходный текст
Ответ на datetime query issue  (Frank Joerdens <frank@x9media.com>)
Список pgsql-sql
Frank,
Use the date_part function to extract the hour and then
find the records which match.

E.g. select id,date_part('hour', mydate) from table1 where date_part('hour', mydate) >= 6 and date_part('hour', mydate)
<=22; 

Troy


>
> I'm not sure how to go about this: I want to find all rows with a timestamp
> between, say 6 a.m. and 10 p.m. for any number of days. The column format is
> datetime. How do I extract the 'time of the day' information from this
> column? What I can think of is to create a view for every single day where datetime
> is > 6 and < 10 and then another query on all views together but that doesn't sound
> very elegant and would be a real memory hog for a large number of days.
>
> Any better ideas?
>
> Thanks
>
> Frank
>
>
> ************
>
>

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