From: Tom Lane <tgl@sss.pgh.pa.us>
To: Terry Brick <terry_brick2000@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Formatting Functions and Group By
Date: Tue, 13 Apr 2004 13:33:18 -0400
Message-ID: <24390.1081877598@sss.pgh.pa.us> (raw)
In-Reply-To: <20040413161305.22857.qmail@web11502.mail.yahoo.com>
References: <20040413161305.22857.qmail@web11502.mail.yahoo.com>
Terry Brick <terry_brick2000@yahoo.com> writes:
> I'm porting a bunch of queries from MySQL to Postgres 7.4 and am having a problem with one
> particular area. For example, a query like this works in MySQL:
> select
> to_char(myCol,'Mon YY')
> from
> myTable
> group by
> to_char(myCol,'MM YYYY')
> order by
> to_char(myCol,'MM YYYY')
Ah, good ol' MySQL :-( ... let the user do what he wants whether the
result is well defined or not ...
I'd suggest doing the grouping/ordering numerically rather than
textually. For instance,
select
to_char(date_trunc('month', myCol), 'Mon YY')
from
myTable
group by
date_trunc('month', myCol)
order by
date_trunc('month', myCol);
Now this assumes you really want a time-based ordering, which the quoted
example doesn't give --- you've got month sorting to the left of year,
is that really what you want? If it is then you'd need to go
group by
date_trunc('month', myCol)
order by
to_char(date_trunc('month', myCol), 'MM YYYY')
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, terry_brick2000@yahoo.com
Subject: Re: Formatting Functions and Group By
In-Reply-To: <24390.1081877598@sss.pgh.pa.us>
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