ERROR 1067 (42000): Invalid default value for 'created_at'

Question

When I tried to alter the table it showed the error:

ERROR 1067 (42000): Invalid default value for \'created_at\'

I googled for this error

Answer 1

You can do it like this:

 CREATE TABLE `ttt` (
  `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  `t1` TIMESTAMP  NULL DEFAULT '0000-00-00 00:00:00',
  `t2` TIMESTAMP  NULL DEFAULT '0000-00-00 00:00:00',
  `t3` TIMESTAMP  NULL DEFAULT '0000-00-00 00:00:00',
  `t4` TIMESTAMP  NULL DEFAULT 0,
  PRIMARY KEY (`id`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;

• Because the TIMESTAMP value is stored as Epoch Seconds, the timestamp value '1970-01-01 00:00:00' (UTC) is reserved since the second #0 is used to represent '0000-00-00 00:00:00'.
• In MariaDB 5.5 and before there could only be one TIMESTAMP column per table that had CURRENT_TIMESTAMP defined as its default value. This limit has no longer applied since MariaDB 10.0.

see: https://mariadb.com/kb/en/mariadb/timestamp/

sample

MariaDB []> insert into ttt (id) VALUES (1),(2),(3);
Query OK, 3 rows affected (0.01 sec)
Records: 3  Duplicates: 0  Warnings: 0

MariaDB []> select * from ttt;
+----+---------------------+---------------------+---------------------+---------------------+
| id | t1                  | t2                  | t3                  | t4                  |
+----+---------------------+---------------------+---------------------+---------------------+
|  1 | 0000-00-00 00:00:00 | 2000-01-01 12:01:02 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 |
|  2 | 0000-00-00 00:00:00 | 2000-01-01 12:01:02 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 |
|  3 | 0000-00-00 00:00:00 | 2000-01-01 12:01:02 | 0000-00-00 00:00:00 | 0000-00-00 00:00:00 |
+----+---------------------+---------------------+---------------------+---------------------+
3 rows in set (0.00 sec)

MariaDB []>