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动态增加列字段:
alter table TableName add column field_id varchar(1024);
动态删除列字段:
alter table TableName drop column field_id;
动态修改列字段:
alter table TableName chande old_field_name new_field_name field_type;
动态修改表结构:
alter table table_name modify column field_name field_type;
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原文地址:http://www.cnblogs.com/qingsong/p/5471810.html