1ALTER TABLE ONLY trends 2 ALTER COLUMN value_min TYPE DOUBLE PRECISION, 3 ALTER COLUMN value_min SET DEFAULT '0.0000', 4 ALTER COLUMN value_avg TYPE DOUBLE PRECISION, 5 ALTER COLUMN value_avg SET DEFAULT '0.0000', 6 ALTER COLUMN value_max TYPE DOUBLE PRECISION, 7 ALTER COLUMN value_max SET DEFAULT '0.0000'; 8ALTER TABLE ONLY history 9 ALTER COLUMN value TYPE DOUBLE PRECISION, 10 ALTER COLUMN value SET DEFAULT '0.0000'; 11