I have a table with two timestamp fields. I simply defined them with a name and the type TIMESTAMP
, yet for some reason MySQL automatically set one of them with a default value and the attribute on update CURRENT_TIMESTAMP
. I was planning on having NO default value in either of the fields, but one of the fields is called "date_updated" so I suppose I could set the mentioned attribute to that field.
Unfortunately, it's the field "date_created" that was set with the on update CURRENT_TIMESTAMP
attribute, and no matter what I do, MySQL won't let me remove it.
I've tried editing the "date_created" field and removing the attribute. When clicking save, the attribute is back. I have also tried selecting both fields, removing the attribute from one of them and setting it on the other. It gives me the error #1293 - Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
and suddenly both attribute columns on the values are set to on update CURRENT_TIMESTAMP
the result:
Error
SQL query:
ALTER TABLE `pages` CHANGE `date_created` `date_created` TIMESTAMP NOT NULL ,
CHANGE `date_updated` `date_updated` TIMESTAMP ON UPDATE CURRENT_TIMESTAMP NOT NULL
MySQL said:
#1293 - Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
Must I really recreate both those columns in the correct order to fix this?
I would like to know how I could solve this problem correctly, for future reference.
Thanks
Now I've also tried to run
ALTER TABLE pages
CHANGE date_created
date_created TIMESTAMP NOT NULL
With both DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP , the column has the current timestamp for its default value and is automatically updated to the current timestamp.
With the DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP, a column has the current timestamp for its default value and is automatically updated to the current timestamp.
You should specify DEFAULT CURRENT_TIMESTAMP
(or DEFAULT 0
)
ALTER TABLE pages CHANGE date_created date_created TIMESTAMP NOT NULL DEFAULT 0,
CHANGE `date_updated` `date_updated` TIMESTAMP ON UPDATE CURRENT_TIMESTAMP NOT NULL
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