Message-ID: <3F4E73C4.3080407@joeconway.com>
Date: Thu, 28 Aug 2003 14:27:32 -0700
From: Joe Conway <mail@joeconway.com>
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To: Chris Faulkner <chrisf@oramap.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: length of array
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Chris Faulkner wrote:
> I would like to do it like this in Oracle
> 
> select field from table N where [conditions]
> and NVL(N.level[1],0) = 0
> and NVL(N.level[2],0) = 0
> and NVL(N.level[3],0) = 0
> and NVL(N.level[4],0) = 0
> 
> So if a row only has two elements in the array, but the first two both had
> values "0", then the row would return.  At the moment, I have this :
> 
> and N.level[1] = 0
> and N.level[2] = 0
> and N.level[3] = 0
> and N.level[4] = 0
> 
> but my row with 2 elements in the array won't be returned with this
> condition.

Is this what you're looking for?

regression=# select * from t1;
  id |    f1
----+-----------
   1 | {1,2}
   2 | {0,0,0}
   3 | {0,0,0,0}
   3 | {1,2,3,0}
(4 rows)

regression=# SELECT * FROM t1 WHERE COALESCE(f1[1],0) = 0 and 
COALESCE(f1[2],0) = 0 and COALESCE(f1[3],0) = 0 and COALESCE(f1[4],0) = 0;
  id |    f1
----+-----------
   2 | {0,0,0}
   3 | {0,0,0,0}
(2 rows)

Joe