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A.drop database數(shù)據(jù)庫(kù)名；刪除數(shù)據(jù)庫(kù)
B.delete from表名；刪除表中所有記錄條
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A.set password for root@'localhost'=password('123');
B.update mysql.user set password=password('123') where user='root' and host='localhost';
C.select password for root@'localhost'=password('123');
D.create user root@'localhost' identified by'123';