PostgreSQL 7.1.3 Documentation
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# 4.8. Updates

You can update existing rows using the UPDATE command. Suppose you discover the temperature readings are all off by 2 degrees as of Nov 28, you may update the data as follow:

    UPDATE weather
        SET temp_hi = temp_hi - 2,  temp_lo = temp_lo - 2
        WHERE date > '1994-11-28';

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