unmatched - Mailing list pgsql-sql

From Brett W. McCoy
Subject unmatched
Date
Msg-id Pine.BSI.3.91.990610200217.15423B-100000@access1.lan2wan.com
Whole thread Raw
Responses Re: [SQL] unmatched
List pgsql-sql
I seem to have a serious brain fart going here.   I have two tables, and 
I want to find out which rows that are in the first do not have a match 
in the second.  If I could create an explicit left join, I could do it by 
finding the rows in the second column that are NULL.  Here's what I kinda 
have, but itjust sits there and never returns anything:

select count(*) from apdf
where apdf.doc_index != ondisk.doc_index;

I tried the NOT IN operator (!!=), but it didn't like that at all.  Is != 
a valid operator?

Brett W. McCoy                                                   http://www.lan2wan.com/~bmccoy
-----------------------------------------------------------------------
"Biology is the only science in which multiplication means the same
thing as division."



pgsql-sql by date:

Previous
From: José Soares
Date:
Subject: Re: [SQL] DataStyle
Next
From: "Ross J. Reedstrom"
Date:
Subject: Re: [SQL] unmatched