Det er enkelt:
for DATETIME:
UPDATE table_name
SET date_col=DATE_FORMAT(date_col,'2013-%m-%d %T');
for DATO:
UPDATE table_name
SET date_col=DATE_FORMAT(date_col,'2013-%m-%d');
Det er enkelt:
for DATETIME:
UPDATE table_name
SET date_col=DATE_FORMAT(date_col,'2013-%m-%d %T');
for DATO:
UPDATE table_name
SET date_col=DATE_FORMAT(date_col,'2013-%m-%d');