ChuckLu - 博客园

2022年11月15日

摘要： Relationships, navigation properties, and foreign keys public class Course { public int CourseID { get; set; } public string Title { get; set; } publi 阅读全文

posted @ 2022-11-15 15:17 ChuckLu 阅读(31) 评论(0) 推荐(0)

What is Owned Entity? When and why to use Owned Entity in Entity Framework Core?

摘要： What is Owned Entity? When and why to use Owned Entity in Entity Framework Core? 回答1 What does this look like without owned entities? If you create an 阅读全文

posted @ 2022-11-15 14:37 ChuckLu 阅读(52) 评论(0) 推荐(0)

The entity type 'Vehicle' cannot be configured as owned because it has already been configured as a non-owned.

摘要： System.InvalidOperationException: The entity type 'Vehicle' cannot be configured as owned because it has already been configured as a non-owned. If yo 阅读全文

posted @ 2022-11-15 14:19 ChuckLu 阅读(276) 评论(0) 推荐(0)

EF Core HasMany vs OwnsMany

摘要： EF Core HasMany vs OwnsMany 回答1 From documentation: EF Core allows you to model entity types that can only ever appear on navigation properties of oth 阅读全文

posted @ 2022-11-15 10:46 ChuckLu 阅读(573) 评论(0) 推荐(1)

2022年11月14日

HTTP Error 500.31 - Failed to load ASP.NET Core runtime IIS issue

摘要：使用ASP.NET Core Diagnostics for IIS/IIS Express Cannot locate runtime config file HttpApi.Host\HttpApi.Host.runtimeconfig.json https://dotnet.microsoft 阅读全文

posted @ 2022-11-14 14:13 ChuckLu 阅读(2093) 评论(0) 推荐(0)

How I can obtain the collation of a specific table in a database?

摘要： How I can obtain the collation of a specific table in a database? 回答1 Collation at the table level is on a per column basis, so it is possible to have 阅读全文

posted @ 2022-11-14 14:09 ChuckLu 阅读(26) 评论(0) 推荐(0)

Use Where Clause With Merge

摘要： Use Where Clause With Merge There is no WHERE in that part of the MERGE statement. See MERGE (Transact-SQL) in the documentation for syntax help. Ther 阅读全文

posted @ 2022-11-14 10:50 ChuckLu 阅读(22) 评论(0) 推荐(0)

2022年11月12日

为什么样本方差（sample variance）的分母是 n-1？

摘要： Standard deviation Bessel's correction 贝塞尔校正为什么样本方差（sample variance）的分母是 n-1？非常好的问题，探索这个问题的答案，不仅能更好的了解自己和这个世界，还能避免被征收“偏差税 ”Bias Tax！先说结论，样本标准差的分母写成阅读全文

posted @ 2022-11-12 16:15 ChuckLu 阅读(592) 评论(0) 推荐(0)

After Effects 2022.11.12

摘要：新建一个蓝色的纯色层菜单栏：窗口-->效果和预设菜单栏：效果-->扭曲-->波形变形新建一个蓝色的纯色层，拖动波形变形的效果。波浪类型，正方形。设置波形宽度400，设置方向为0，波形速度5.0 设置波形高度的关键帧，0秒高度0，1秒设置波形高度600或者500。2秒再把波形高度设置为0。3 阅读全文

posted @ 2022-11-12 12:37 ChuckLu 阅读(38) 评论(0) 推荐(0)

Python String Slicing

摘要： Strings and Character Data in Python String Slicing Python also allows a form of indexing syntax that extracts substrings from a string, known as stri 阅读全文

posted @ 2022-11-12 10:25 ChuckLu 阅读(43) 评论(0) 推荐(0)

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