Re: VIEW / ORDER BY + UNION

Otherwise you can treat this as a subselect and suround it with another
select.

Like
select * from (<here goes your ex.>) order by orderno;

C:\> -----Original Message-----
C:\> From: Bruno Wolff III [mailto:bruno(at)wolff(dot)to]
C:\> Sent: Mittwoch, 23. Februar 2005 18:20
C:\> To: WeiShang
C:\> Cc: pgsql-sql(at)postgresql(dot)org
C:\> Subject: Re: [SQL] VIEW / ORDER BY + UNION
C:\>
C:\>
C:\> On Thu, Feb 17, 2005 at 23:46:59 +0800,
C:\> WeiShang <thanks(at)verymuch(dot)com> wrote:
C:\> > Hi, I have created a view like this :
C:\> >
C:\> > CREATE VIEW v1 AS (SELECT orderno,weekday,time FROM t1,t2 where
C:\> > t1.orderno=t2.orderno);
C:\> >
C:\> > if I create a SQL statment:
C:\> >
C:\> > (SELECT orderno FROM v1 WHERE weekday='MON' ORDER BY orderno)
C:\> > UNION
C:\> > (SELECT orderno FROM v1 WHERE weekday='WED' ORDER BY orderno)
C:\> > UNION
C:\> > (SELECT orderno FROM v1 WHERE weekday='FRI' ORDER BY orderno);
C:\> >
C:\> > Will the whole result will be sorted by the field orderno?
C:\>
C:\> If this isn't a made up example, you don't want to do this. You
C:\> should use IN or OR to select records corresponding to the days
C:\> of interest and then use ORDER BY to select the ordering.
C:\>
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