PostgreSQL 7.4.11 Documentation
Prev | Fast Backward | Chapter 2. The SQL Language | Fast Forward | Next

# 2.9. Deletions

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

    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!

Prev | Home | Next
Updates | Up | Advanced Features