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22 小时 31 分钟前

回复了 baby0w0 创建的主题 iPhone 你们的 iPhone 都贴膜了吗

一年一换还需要贴啥，超瓷晶面板本来就防刮

28 天前

回复了 yomate 创建的主题数据库 sql server where 查询时字段是 nvarchar 类型的保存的数字但是可以用 int 类型的数字去匹配,这是什么原理?

DBMS 都有的类型转换，因为不是用户直接指定的，所以称为隐式类型转换。隐式类型转换可能会导致无法使用索引。避免隐式类型转换是索引优化方法之一

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