根据文档
timestamp并
datetime输入列:
如果
TIMESTAMP或DATETIME列定义在任何地方都包含显式的小数秒精度值,则在整个列定义中必须使用相同的值。这是允许的:
CREATE TABLE t1 ( ts TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP(6) ON UPDATECURRENT_TIMESTAMP(6)
);
其他例子 :
mysql> create table tbl_so_q23671222_1( ts timestamp(3) default now() );ERROR 1067 (42000): Invalid default value for 'ts'mysql> create table tbl_so_q23671222_1( ts timestamp(3) default now(3) );Query OK, 0 rows affected (0.59 sec)mysql> create table tbl_so_q23671222_2( ts timestamp(3) default current_timestamp );ERROR 1067 (42000): Invalid default value for 'ts'mysql> create table tbl_so_q23671222_2( ts timestamp(3) default current_timestamp(3) );Query OK, 0 rows affected (0.38 sec)mysql> desc tbl_so_q23671222_1;+-------+--------------+------+-----+----------------------+-------+| Field | Type | Null | Key | Default | Extra |+-------+--------------+------+-----+----------------------+-------+| ts | timestamp(3) | NO | | CURRENT_TIMESTAMP(3) | |+-------+--------------+------+-----+----------------------+-------+1 row in set (0.01 sec)mysql> desc tbl_so_q23671222_2;+-------+--------------+------+-----+----------------------+-------+| Field | Type | Null | Key | Default | Extra |+-------+--------------+------+-----+----------------------+-------+| ts | timestamp(3) | NO | | CURRENT_TIMESTAMP(3) | |+-------+--------------+------+-----+----------------------+-------+1 row in set (0.01 sec)
请参阅 :
TIMESTAMP和DATETIME的初始化和更新
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