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12 lip 2015 · In version 5.6.5, it is possible to set a default value on a datetime column, and even make a column that will update when the row is updated. The type definition: CREATE TABLE foo ( `creation_time` DATETIME DEFAULT CURRENT_TIMESTAMP, `modification_time` DATETIME ON UPDATE CURRENT_TIMESTAMP )
28 kwi 2011 · As of MySQL 5.6.5, you can use the DATETIME type with a dynamic default value: CREATE TABLE foo ( creation_time DATETIME DEFAULT CURRENT_TIMESTAMP, modification_time DATETIME ON UPDATE CURRENT_TIMESTAMP ) Or even combine both rules: modification_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP.
MySQL retrieves and displays DATETIME values in 'YYYY-MM-DD hh:mm:ss' format. The supported range is '1000-01-01 00:00:00' to '9999-12-31 23:59:59'. The TIMESTAMP data type is used for values that contain both date and time parts.
1 sty 1970 · By default, DATETIME values range from 1000-01-01 00:00:00 to 9999-12-31 23:59:59. MySQL uses 5 bytes to store a DATETIME value. In addition, a DATETIME value can include a trailing fractional second up to microseconds with the format YYYY-MM-DD HH:MM:SS[.fraction] e.g., 2015-12-20 10:01:00.999999.
For numeric types, the default is 0, with the exception that for integer or floating-point types declared with the AUTO_INCREMENT attribute, the default is the next value in the sequence. For date and time types other than TIMESTAMP, the default is the appropriate “zero” value for the type.
Automatic initialization and updating to the current date and time for DATETIME columns can be specified using DEFAULT and ON UPDATE column definition clauses, as described in Section 13.2.5, “Automatic Initialization and Updating for TIMESTAMP and DATETIME”.
Use the NOW () function to get the current date and time of the server. Use the DEFAULT NOW () for a column to set the default value for the column to the current date and time when a row is inserted. Use the ON UPDATE NOW () for a column to set a default for a column to the current date and time when a row is updated.
