A alter table student add constraint sex_df default '男' for sex
B alter table student add constraint default '考查' for sex
C alter table student add constraint default '男' for sex
D alter table student add default '男' for sex
A alter table student add constraint sex_df default '男' for sex
B alter table student add constraint default '考查' for sex
C alter table student add constraint default '男' for sex
D alter table student add default '男' for sex
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