When I create a table with a timestamp column, that column is magically defined as NOT NULL DEFAULT CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP. Ignoring how weird this is so far, I would like to change it to have no default and no special "on update" behavior.When I create a table with a timestamp column,
阅读背景：
是否可以定义一个非空的、没有默认值且在更新时没有特殊行为的时间戳列?
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