From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | "Robert B(dot) Easter" <reaster(at)comptechnews(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: BETWEEN [SYMMETRIC | ASYMMETRIC] |
Date: | 2001-01-09 23:58:15 |
Message-ID: | 7784.979084695@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
"Robert B. Easter" <reaster(at)comptechnews(dot)com> writes:
> subselects=# SELECT 2 BETWEEN 3 AND 1;
> ?column?
> ----------
> f
> (1 row)
SQL92 quoth:
6) "X BETWEEN Y AND Z" is equivalent to "X>=Y AND X<=Z".
so this is correct behavior, even if it might seem surprising.
> Any chance of BETWEEN [SYMMETRIC | ASYMMETRIC] being implemented?
> SELECT 2 BETWEEN SYMMETRIC 3 AND 1;
> ?column?
> ----------
> t
> (1 row)
Build a function based on this idea:
regression-# select case
regression-# when 3 < 1 then 2 between 3 and 1
regression-# else 2 between 1 and 3
regression-# end;
case
------
t
(1 row)
I don't really see this as important enough to justify introducing a
nonstandard syntax for it...
regards, tom lane
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