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如何修改表中的字段约束条件(类型，default, null等)
2022-07-06 03:40:00 【两片空白】
注意修改为不能为空，表中的数据中，该字段不能有空的值，有的话要删除
1. 通过修改字段名来修改
alter table 表名 change 字段名 修改的字段名 + 类型 + 约束条件
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