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https://leo-yang0201.github.io/leo-yang0201.github.io/2020/03/14/Java%E9%9D%A2%E8%AF%95%E9%A2%98%E6%A8%A1%E5%9D%97%E5%85%AD/
数据库的三范式是什么 第一范式:强调的是列的原子性,数据表的每一列都不可再分 第二范式:要求实体的属性完全依赖于主关键字。不能存在仅依赖主关键字一部分的属性 第三范式:任何非主属性不依赖于其他非主属性,消除传递依赖 数据库的事务隔离级别由低到高依次为 Read uncommitted(读未提交), Read committed(读提交), Repeatable read(可重复读), Seria
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https://leo-yang0201.github.io/leo-yang0201.github.io/2020/03/14/Java%E9%9D%A2%E8%AF%95%E9%A2%98%E6%A8%A1%E5%9D%97%E5%85%AD/
数据库的三范式是什么 第一范式:强调的是列的原子性,数据表的每一列都不可再分 第二范式:要求实体的属性完全依赖于主关键字。不能存在仅依赖主关键字一部分的属性 第三范式:任何非主属性不依赖于其他非主属性,消除传递依赖 数据库的事务隔离级别由低到高依次为 Read uncommitted(读未提交), Read committed(读提交), Repeatable read(可重复读), Seria
The text was updated successfully, but these errors were encountered: