Обсуждение: Extract week from date

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Extract week from date

От
Dani Castaños
Дата:
Hi again,

I need to extract date grouped by week from an statistics table.

I was trying something like this:

SELECT total_duration, EXTRACT( week from date statistics_date )
FROM statistics_daily
GROUP BY EXTRACT( week from date statistics_date ), total_duration;

But it doesn't works... Neither:

SELECT total_duration, statistics_date
FROM statistics_daily
GROUP BY EXTRACT( day from statistics_date ), total_duration,
statistics_date;


How can it be done?


Note: statistics_date is a DATE data type column.

Regards.

--
Dani Castaños Sánchez
dcastanos@androme.es

Re: Extract week from date

От
Filip Rembiałkowski
Дата:

2009/5/18 Dani Castaños <dcastanos@androme.es>
Hi again,

I need to extract date grouped by week from an statistics table.

I was trying something like this:

SELECT total_duration, EXTRACT( week from date statistics_date )
FROM statistics_daily
GROUP BY EXTRACT( week from date statistics_date ), total_duration;

But it doesn't works... Neither:

SELECT total_duration, statistics_date
FROM statistics_daily
GROUP BY EXTRACT( day from statistics_date ), total_duration,
statistics_date;


hmmm.. it's not clear what do you want.

why not just something like

SELECT  EXTRACT( week from statistics_date ) as week, SUM(
total_duration) as total_duration_sum
FROM statistics_daily GROUP BY 1;


?



--
Filip Rembiałkowski
JID,mailto:filip.rembialkowski@gmail.com
http://filip.rembialkowski.net/

Re: Extract week from date

От
Dani Castaños
Дата:

Dow!!! You’re ok! I forgot the aggregator funciont SUM!

 

Thanks!

 

De: Filip Rembiałkowski [mailto:plk.zuber@gmail.com]
Enviado el: lunes, 18 de mayo de 2009 16:54
Para: Dani Castaños
CC: pgsql-sql@postgresql.org
Asunto: [?? Probable Spam] Re: [SQL] Extract week from date

 

 

2009/5/18 Dani Castaños <dcastanos@androme.es>

Hi again,

I need to extract date grouped by week from an statistics table.

I was trying something like this:

SELECT total_duration, EXTRACT( week from date statistics_date )
FROM statistics_daily
GROUP BY EXTRACT( week from date statistics_date ), total_duration;

But it doesn't works... Neither:

SELECT total_duration, statistics_date
FROM statistics_daily
GROUP BY EXTRACT( day from statistics_date ), total_duration,
statistics_date;


hmmm.. it's not clear what do you want.

why not just something like

SELECT  EXTRACT( week from statistics_date ) as week, SUM(
total_duration) as total_duration_sum
FROM statistics_daily GROUP BY 1;



?



--
Filip Rembiałkowski
JID,mailto:filip.rembialkowski@gmail.com
http://filip.rembialkowski.net/