How to create an association that sets join table attributes automatically?
如何创造一套联接表的属性自动关联吗？
The columns view allows you to define the table attributes and columns in a table.
columns视图允许您定义表的属性和列。
When changing these table attributes using SQL, it is no longer necessary to drop the table and then recreate it.
在使用SQL修改这些表属性时，不再需要删除表并重新创建它。
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