1832-cannot change column 'c_id' :used in a foreign key解决方法，已解决
1.字段c_id忘记勾选“不是null”选项，重新勾上，按ctrl+s保存时，报错。 2.报错原因：存在c_id的外键，不允许修改，于是删除此外键 3.删除外键截图： 4.ctrl+s保存字段： 5.重新加上外键： 6.成功解决。
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