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create table test (d1 varchar(20), d2 varchar(20))
insert into test values ('2018-04-07', '2018-04-07')
select * from test
d1
d2
2018-04-07
2018-04-07
ALTER TABLE test MODIFY d1 DATE, MODIFY d2 DATETIME
select * from test
d1
d2
2018-04-07
2018-04-07 00:00:00