How to Default Timestamp and/or Update timestamps with MySQL?
A lot of relational tables need created and update timestamps columns. I prefer having them for all tables with no exception. However, most of applications I am working on are running MySQL. MySQL has minor limitation on timestamps. Unfortunately you can create only one time stamp column that has DEFAULT NOW() value. Read more to see how to avoid this limitation. The simplest way to do this is create the following columns in the table:
stamp_updated timestamp default now() on update now()
But MySQL will return the following error:
ERROR 1293 (HY000): Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_ in DEFAULT or ON UPDATE clause
You can use only one of the definitions in one table. However here is the way how to create both timestamps columns:
id integer not null auto_increment primary key,
stamp_created timestamp default ‘0000-00-00 00:00:00′,
stamp_updated timestamp default now() on update now()
);
Note that it is necessary to enter nulls into both columns during ‘insert’:
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Thanks, Neocoder