PostgreSQL 9.3.9 Documentation
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# 2.9. Deletions

Rows can be removed from a table using the `DELETE` command. Suppose you are no longer interested in the weather of Hayward. Then you can do the following to delete those rows from the table:

    DELETE FROM weather WHERE city = 'Hayward';

All weather records belonging to Hayward are removed.

    SELECT * FROM weather;

         city      | temp_lo | temp_hi | prcp |    date
    ---------------+---------+---------+------+------------
     San Francisco |      46 |      50 | 0.25 | 1994-11-27
     San Francisco |      41 |      55 |    0 | 1994-11-29
    (2 rows)

One should be wary of statements of the form

    DELETE FROM tablename;

Without a qualification, `DELETE` will remove all rows from the given table, leaving it empty. The system will not request confirmation before doing this!

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