题解 | #在last_update后面新增加一列名字为create_date#
在last_update后面新增加一列名字为create_date
http://www.nowcoder.com/practice/119f04716d284cb7a19fba65dd876b03
ADD column with column definition before or after one specific column
ALTER TABLE actor
ADD COLUMN create_date datetime NOT NULL DEFAULT '2020-10-01 00:00:00'
AFTER last_update
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