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SELECT version();
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CREATE EXTENSION "cube"; -- you will not be able install "earthdistance" w/o "cube" extension
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CREATE EXTENSION "earthdistance"; --or any other extension you need
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create extension earthdistance;
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select earth();
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select earth_distance(ll_to_earth(12.4,2.0),ll_to_earth(12.456,2.8043)); -- 87km
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