第一范式:字段内容不可分割,可以继续拆分就是不满足第一范式
在项目中违反过第一范式,用过enable_status字段
1:启动,纳入并表
0:表示不启动
-1:启动,退出并表
-9:表示逻辑删除
1和0表示内容是可以拆分的,应该再新建一个字段表示是否纳入并表
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