下列说法正确的是()
A.alter table user drop column sex;
B.alter table user add sex varchar(20);
C.alter table user drop sex;
D.alter table user modify id int primary key;
下列说法正确的是()
A.alter table user drop column sex;
B.alter table user add sex varchar(20);
C.alter table user drop sex;
D.alter table user modify id int primary key;
D,B,A,C
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