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  1. or download this
    $ psql
psql (9.2.4)
Type "help" for help.
...
--------+-----------------------+-----------
 foo    | integer               | 
 bar    | character varying(25) |
  2. or download this
    # drop table if exists my_table; -- exists
DROP TABLE
# drop table if exists my_table; -- no table is no problem:
DROP TABLE
#