Color coding from two data sources

[Don Drake]

Here's my scenario, I have shapefiles containing polygons of zipcodes.  I
have a table in Postgres that has a zip code with data that I would like to
thematically map.  I am not interested in loading the zipcodes into PostGIS
if I don't have to.  I am using PHP/Mapscript, and I was wondering if there
is a way to merge the Postgres data with the shapefile layer on a map?

Thanks.

-Don
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