[postgis-devel] case statement to cath nulls on joined tables

[John Morgan]

Hello,

I am doing a left outer join between a polygon table and a data table.
 Everything
returns fine from this join as expected.  However, there are cases where
there isn’t data for a given polygon and this return as the expected null
in the result set.  I would like to utilize something like a case statement
to catch the nulls and return a “more friendly” message.  I have tried
unsuccessfully to use the following logic:

*Select case value_of_interest null then ‘more friendly message’ else
value_of_interest end*

*From poly_table left outer join data_table one poly_table.common_id =
data_table.common_id*

If someone could let me know where I am going wrong it would be greatly
appreciated.

Cheers,

Derek
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-devel/attachments/20120202/5673e361/attachment.html>