Either use '' as some_type, or use COALESCE(some_type, '').
On Mon, Jun 27, 2011 at 9:53 AM, Asfand Qazi (Sanger Institute) <aq2.sanger@gmail.com> wrote:
Hello,
So I have am playing with a view to test the feasibility of a technique for storing some data.
It basically goes something like this:
CREATE VIEW formatted_table AS SELECT name, replace(some_template, '@', some_type) AS some_field FROM some_table;
some_template is something like 'foo@bar' or 'foobar' (note the missing template character).
some_type is a single letter like 'a' or 'b', or it can be NULL.
The above view works fine for rows where some_type is a letter, and some_field ends up as 'fooabar' or whatever.
However, when some_type is NULL, some_field ends up as NULL as well. I understand that this is expected behaviour, but how do I cause the view to treat a some_type of NULL as an empty string, so that some_field simply ends up as 'foobar'?
