How to convert zero length string to null ?
UPDATE yourtable SET name=NULL WHERE name='';
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On 03/23/2010 11:47 AM, John R Pierce wrote:
How to convert zero length string to null ?
UPDATE yourtable SET name=NULL WHERE name='';
No I don't want to replace it in the table. Just in the query result.
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Nilesh Govindarajan
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On 03/23/2010 12:17 PM, Sreelatha G wrote:
Hi,
select case when name='' then null end from table;
Thanks
Sreelatha
On Tue, Mar 23, 2010 at 12:03 PM, Nilesh Govindarajan li...@itech7.com
mailto:li...@itech7.com wrote:
On 03/23/2010 11:47 AM, John R Pierce wrote:
How to
On Tue, Mar 23, 2010 at 5:33 PM, Nilesh Govindarajan li...@itech7.com wrote:
On 03/23/2010 11:47 AM, John R Pierce wrote:
How to convert zero length string to null ?
UPDATE yourtable SET name=NULL WHERE name='';
No I don't want to replace it in the table. Just in the query result.
use a
Hi,
In my query, some rows have null values (length 0).
I wish to replace them with some constant.
I think I am wrong somewhere in this query using coalesce():
select coalesce(u.name, 'anon'), nodecount from users u, ( select n.uid
userid, count(n.nid) nodecount from node n group by n.uid
Nilesh Govindarajan wrote:
Hi,
In my query, some rows have null values (length 0).
a NULL value is not length 0, NULL is not the empty string, rather, NULL
is no value at all.
if you want to change a 0 length string to something, use a CASE or
something.
select CASE WHEN u.name = ''
On 03/23/2010 10:07 AM, John R Pierce wrote:
Nilesh Govindarajan wrote:
Hi,
In my query, some rows have null values (length 0).
a NULL value is not length 0, NULL is not the empty string, rather, NULL
is no value at all.
if you want to change a 0 length string to something, use a CASE or
On 03/23/2010 09:47 AM, Osvaldo Kussama wrote:
2010/3/23 Nilesh Govindarajanli...@itech7.com:
Hi,
In my query, some rows have null values (length 0).
NULL or a zero lenght string?
I wish to replace them with some constant.
I think I am wrong somewhere in this query using coalesce():
Hi there,is there a simple way to replace NULL values in multiple columns within the SQL statement? I changed the underlaying country template of your database; so now there are a couple of NULL values when I join the stats-table with the country table. Unfortunately, my queries have always
On Thu, Sep 07, 2006 at 07:45:19AM +0200, Stefan Schwarzer wrote:
Hi there,
is there a simple way to replace NULL values in multiple columns
within the SQL statement? I changed the underlaying country template
of your database; so now there are a couple of NULL values when I
join the
On Thu, Sep 07, 2006 at 07:45:19AM +0200, Stefan Schwarzer wrote:
Hi there,
is there a simple way to replace NULL values in multiple columns
within the SQL statement? I changed the underlaying country template
of your database; so now there are a couple of NULL values when I
join the
On Thu, Sep 07, 2006 at 11:54:43AM +0200, Stefan Schwarzer wrote:
As I said, I couldn't figure out how COALESCE would work on multiple
columns (without naming them explicitly).
So, say I have a table with columns for each year between 1970 and
2005. For specific countries the values
Aside from your database structure being problematic, what are you
trying to accomplish?
In other words, what do you want to replace the nulls with and in what
circumstance?
I imagine your table looks like this
ID,country,1950,1951,1952,1953,
1 usa50 null 70 10
2 canada 10 45
I have an internet map server connected to my database. Until now,
no data fields within the table were filled with a -, i.e.
- equalled no data available.
Now, for displaying a map with different classes (red for values from
0-100, green for values from 100-200) I need to
On Thu, Sep 07, 2006 at 12:58:17PM +0200, Stefan Schwarzer wrote:
Unfortunately the mapserver can't deal with NULL values. So, I can't
build a class saying
if values = NULL do something
but instead it only works with fake NULL values as -
if values = - do something
Once again Martijn is correct, and you have to use is null not =null
One thing you might want to consider is adding - as a default value
in the table so that when new data is entered it with a null it
automatically gets the correct value.
Using coalesce with the value will probably be the
Thanks for your suggestions.
You're right with the is versus = for NULL values. Unfortunately
the coding for the mapserver does not allow an IS statement.
Concerning the coalesce(datafield,-) it seems rather unusable for
me, if I have to explicitly stated each column, as a) for many
It seems like the mapserver is quite inflexible. Maybe there are options
to loosen it up a little? (I've found that pouring beer into the
keyboard after a long week does not help.)
I would venture that your best option is to write a quick pgpsql
function that goes over all the fields in the
On Thu, Sep 07, 2006 at 01:39:06PM +0200, Stefan Schwarzer wrote:
You're right with the is versus = for NULL values. Unfortunately
the coding for the mapserver does not allow an IS statement.
There's a hack for this; you need to turn it on in the config file.
I think it's called
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