I'm not sure what the sql standard says on the matter, but Oracle, DB2 and Postgres would through an exception. In fact, there is a page on MySQL "gotachs" to document MySQL behaviour when it differs significnatly from other databases (like the first datetime field in a table getting a value if none is provided during insert).
I assume you mean "timestamp", not "datetime". Not trying to be picky, I just don't want to confuse anyone out there.
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