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PostgreSQL 8.1.4 Documentation | ||||
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You can update existing rows using the UPDATE command. Suppose you discover the temperature readings are all off by 2 degrees as of November 28. You may update the data as follows:
UPDATE weather SET temp_hi = temp_hi - 2, temp_lo = temp_lo - 2 WHERE date > '1994-11-28';
Look at the new state of the data:
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 Hayward | 35 | 52 | | 1994-11-29 (3 rows)