Message-Id: <4.1.19990518203016.00ae1d00@mail.venux.net>
Date: Tue, 18 May 1999 20:39:41 -0400
To: pgsql-interfaces@postgreSQL.org
From: Matthew Hagerty <matthew@venux.net>
Subject: Problems with money fields.
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Hello,

I was wondering if someone could shed some light on money fileds for me.  I
am having a problem in that a money field plus a null money field equals
null.  Try this:

create table test(total money);
insert into test values('');
insert into test valuse(NULL);

select * from test;
total
-----
$0.00
     
(2 rows)

select '1'::money + total from test;
?column?
--------
$1.00   
        
(2 rows)

Why is the second column blank?  This is really throwing my calculations
because there are times when $0.00 is different from no value at all.
Also, how can I get a query of all rows where the money value is NULL?
This fails:

select * from test where total = NULL;
ERROR:  parser: parse error at or near "null"

and this gives me the rows with $0.00:

select * from test where total = '';  
total
-----
$0.00
(1 row)

If I can't query for a money field with a NULL value, why can I insert one?

Thank you,
Matthew Hagerty