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DbArithmeticExpression arguments must have a numeric common type
...od accepts Nullable<DateTime>.
Entity Framwork core (when used with Sql Server, maybe other db providers) supports the DateTime AddXxx functions (like AddHours). They're translated into DATEADD in SQL.
*EntityFunctions prior to Entity Framework version 6.
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Good reasons NOT to use a relational database?
...l databases? In my opinion, most applications rarely use the full power of SQL--it would be interesting to see how to build an SQL-free application.
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Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...地址自2024年7月无法访问下载docker版本，小编已经将可以使用的docker、docker-compose版本整理在百度网盘中如有需要可以自行获取。
2）docker、docker-compose版本获取：百度网盘获取方式
备注：近期接到各位博友反馈，百度网盘链接...
String concatenation does not work in SQLite
I am trying to execute a SQlite replace function, but use another field in the function.
4 Answers
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Can I return the 'id' field after a LINQ insert?
When I enter an object into the DB with Linq-to-SQL can I get the id that I just inserted without making another db call? I am assuming this is pretty easy, I just don't know how.
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Create unique constraint with null columns
...otal on top).
Aside: I advise not to use mixed case identifiers in PostgreSQL.
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WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT
I'm looking at the AdventureWorks sample database for SQL Server 2008, and I see in their creation scripts that they tend to use the following:
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mfc里面的140种颜色宏 - C/C++ - 清泛网 - 专注C/C++及内核技术
mfc里面的140种颜色宏MFC编码是需要配色的，可以参考使用。#pragma once #define CLR_LIGHTPINK RGB(255, 182, 193) ...mfc编码时需要配色的，可以参考使用。
#pragma once
#define CLR_LIGHTPINK RGB(255, 182, 193) // 浅粉红
#...
Computed / calculated / virtual / derived columns in PostgreSQL
Does PostgreSQL support computed / calculated columns, like MS SQL Server? I can't find anything in the docs, but as this feature is included in many other DBMSs I thought I might be missing something.
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sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and t
... is also not recommended for security concerns - docs.python.org/3/library/sqlite3.html
– wesinat0r
Jul 6 at 14:57
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