MYSQL Abfrage Timestamp-Spalte

Question

MYSQL VERSION zu verändern.

// TO ALLOW NULL AND SET CURRENT_TIMESTAMP AS DEFAULT: 
ALTER TABLE `business` MODIFY `created` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP; 
// TO ALLOW NULL AND SET CURRENT_TIMESTAMP AS DEFAULT AND ON UPDATE: 
ALTER TABLE `business` MODIFY `modified` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP; 

Wenn Sie:

Ich habe versucht, den Zeitstempel coulmn in mysql mit der folgenden Abfrage zu ändern: Das sollte funktionieren #1067 - Invalid default value for 'modified'

Answer 1

ALTER TABLE `business` MODIFY `created` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL; 
ALTER TABLE `business` MODIFY `modified` TIMESTAMP on update CURRENT_TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL; 

Aber ich erhalte den Fehler will nicht zulassen, null dann nur entfernen Sie die NULL:

// DO NOT ALLOW NULL, SET CURRENT_TIMESTAMP AS DEFAULT: 
ALTER TABLE `business` MODIFY `created` TIMESTAMP DEFAULT CURRENT_TIMESTAMP; 
// DO NOT ALLOW NULL, SET CURRENT_TIMESTAMP AS DEFAULT AND ON UPDATE: 
ALTER TABLE `business` MODIFY `modified` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;