[mapserver-users] PostGIS Data Query vs Expression

[Travis Kirstine]

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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