Re: Group by minute

[Mezei Zoltán <mezei(dot)zoltan(at)telefor(dot)hu>]

Ezequias Rodrigues da Rocha wrote:

Hil list,

I have a query but my IDE (Delphi) does not accept "to_char" capability. Is there a way to reproduce the same query without using to_char function ?

Here is my query:
SELECT  to_char(quando,'dd/MM/yyyy HH24:MI'),count(id)
FROM base.tentativa
WHERE  (SESSAO_ID = 15)
GROUP BY to_char(quando,'dd/MM/yyyy HH24:MI')
order by 1

That seems like a valid query in Oracle :-)

Postgres have a slightly different mechanism for handling date and time. The modified query:

SELECT  date_trunc('minute', quando),count(id)
FROM base.tentativa
WHERE  (SESSAO_ID = 15)
-- GROUP BY to_char(quando,'dd/MM/yyyy HH24:MI')
GROUP BY date_trunc('minute', quando)
order by 1

You should read:
http://www.postgresql.org/docs/8.1/interactive/functions-datetime.html

Zizi