(3) 删除表字段: alter table table_name drop column col_name;
(4) 添加表字段: alter table table_name add col_name varchar2(20) null ;
alter table student alter column sge int
sp_rename 'table.age','stu_age','column'
(3) 删除表字段: alter table table_name drop column col_name;
(4) 添加表字段: alter table table_name add col_name varchar2(20) null ;
alter table student alter column sge int
sp_rename 'table.age','stu_age','column'
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