What does the Alter Table syntax look like for adding a DATETIME column?

问题

I can't find what the syntax looks like for adding a DATETIME column to a mysql table when I want to set the default to - example - 2011-01-26 14:30:00

Does anyone know what that syntax looks like?

Here's what I've got

ADD COLUMN new_date DATETIME AFTER preceding_col,

Thanks

回答1:

If you ever have doubts, the syntax is explained here http://dev.mysql.com/doc/refman/5.5/en/alter-table.html

ALTER TABLE yourTable 
  ADD COLUMN new_date DATETIME NOT NULL DEFAULT 20110126143000 AFTER preceding_col

or

ALTER TABLE yourTable 
  ADD COLUMN new_date DATETIME NOT NULL DEFAULT '2011-01-26 14:30:00' AFTER preceding_col

(I just prefer the numeric DATETIME format)

回答2:

ALTER TABLE  `yourTable`
ADD `new_date` DATETIME NOT NULL
DEFAULT '2011-01-26 14:30:00'
AFTER `preceding_col`

来源：https://stackoverflow.com/questions/4810066/what-does-the-alter-table-syntax-look-like-for-adding-a-datetime-column