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A.select max（score）fromt_score
B.select min（score）fromt_score
C.select avg（score）fromt_score
D.select sum（score）fromt_score

A.create user tom@’localhost’identified by’123’
B.drop user tom@’localhost’
C.add user tom@’%’identified by’123456’
D.alter user tom@’localhost’identified by’123456’