Update CartoDB-user-table.rst
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@ -11,7 +11,7 @@ The required columns of a CartoDB table are:
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- ``cartodb_id``
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- This column will be used as the primary key of the table and it has a sequence as default value
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- Its values must be integer, non-null and unique
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- Its values must be integer, non-zero, non-null and unique
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- The type of the column in the Postgres database is ``bigint``
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- B-Tree indexed
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- ``the_geom``
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