From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Weiping He <laser@zhengmai.com.cn>
Cc: pgsql-docs@postgresql.org
Subject: Re: doc question about column name alias
Date: Mon, 25 Jun 2001 11:06:19 -0400 (EDT)
Message-ID: <200106251506.f5PF6J905523@candle.pha.pa.us> (raw)
In-Reply-To: <3B374CF6.C1AB82F0@zhengmai.com.cn>
> Hi,
> I'm translating 7.1.2's doc to Chinese, and got one question while
> doing these,
> in queries.sgml line 795:
>
> SELECT a AS b FROM table1 ORDER BY a;
>
> I think it should be:
>
> SELECT a AS b FROM table1 ORDER BY b;
>
> but from the context:" References to column names in the FROM clause
> that are renamed in the select list are also allowed:"
> it seems the original is correct. Am I misunderstood? How the SQL
> standard saids?
> Thanks.
Both work:
test=> select relname as x from pg_class order by relname;
and
test=> select relname as x from pg_class order by x;
I am not sure which is more standards-compliant.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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To: pgsql-docs@postgresql.org
Cc: pgman@candle.pha.pa.us, laser@zhengmai.com.cn
Subject: Re: doc question about column name alias
In-Reply-To: <200106251506.f5PF6J905523@candle.pha.pa.us>
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