How to save a a CartoDB buffer to its own data table/layer

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This seems like a dumb question, but I want to create (or add to) test_table2 a buffer feature from test_table1 point layer.

INSERT INTO test_table2 (SELECT ST_Buffer(the_geom_webmercator, 1000) AS the_geom_webmercator, cartodb_id FROM test_table1)In this example, test_table2 already exists and shares the same columns as test_table1



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