timestamp « Data Types « MySQL Tutorial

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10.24.timestamp
	10.24.1.	The timestamp data type stores the time that a row was last changed
	10.24.2.	TIMESTAMP NULL DEFAULT '0000-00-00 00:00:00'
	10.24.3.	TIMESTAMP NULL DEFAULT NULL
	10.24.4.	You can include the NULL attribute in the definition of a TIMESTAMP column to allow the column to contain NULL values. For example:
	10.24.5.	mysql> SELECT MICROSECOND('2010-12-10 14:12:09.019473');
	10.24.6.	TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP

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