# 2.8. Updates
You can update existing rows using the UPDATE
command. Suppose you discover the temperature readings are all off by 2 degrees after November 28. You can correct 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