Anything you can do in the data definition limits the number of features sent over the network, so that's preferable. Class expressions are generally used to sort features you want to draw differently.
Steve From: [email protected] [mailto:[email protected]] On Behalf Of Travis Kirstine Sent: Friday, February 07, 2014 9:51 AM To: [email protected] Subject: [mapserver-users] PostGIS Data Query vs Expression What is the best practice for using selecting data with a where clause in MapServer using PostGIS connection i.e. DATA "the_geom from (SELECT gid, the_geom FROM audience_table WHERE audience = 'Farmers') as foo using unique gid using SRID=4326" OR DATA "the_geom from audience_table using SRID=4326" with a class expression CLASSITEM audience .... EXPRESSION 'Farmer' Thanks
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