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Introduction
Geometry vs. Geography
Summary

Instruction

Great! What about some of the other PostGIS functions that we got to know in this course? Unfortunately, they do not support geography. This means they will return an error when you try to use a geography column as their parameter. Let's take a look at this in the exercise.

Exercise

Try to run the example query, which attempts to form a single polygon around representing all US states.

As you can see, the query failed.