NULL is a special value in SQL that represents a missing or an unknown value. NULL is used for fields with unknown or inapplicable values. It's different from an empty or zero value. No two NULL values are equal. Any field in a table can be defined to allow (or not allow) NULL val...
I tend to hate it too, except that sometimes it is necessary. But my point is totally different from Date’s. I have nothing against the idea ofNULL, I just think that it is wrong by design in SQL. BecauseNULLhas two incompatible meanings, and depending from the context, the SQL stand...
AES encryption error: The input data is not a complete block? After Download a Document or file and To redirect to another page in C#.net After IIS deployment can not connect to SQL SERVER 2008 EXPRESS after response.write ,how to execute Response.Redirect(Request.RawUrl) ajax call does no...
The first change I'm going to discuss is the new query interface. To be exact, this feature has been introduced in SQLAlchemy 1.4 releases as a way to help developers transition to 2.0, so you may have already seen it. The now "legacy" way to issue queries in the SQLAlchemy ORM cons...
In C#, a nullable type allows you to assign an additional value, null, to value types such as integers, floats, booleans, etc., which by default cannot hold a null value. It provides a way to represent the absence of a value for value types....
!> in c# . Check is object null - What are the options? .Net 4 FileLoadException permissions problem With windows service .NET code to extract data from an excel sheet and create a text file having a specific format .Net Core 3.0 Console App. Microsoft.Data.SQLClient is not supported ...
PostgreSQL 16 introduces quite a few improvements to the query planner and makes many SQL queries run faster than they did on previous versions of PostgreSQL. If you look at thePG16 release notes, you’ll see some of these planner improvements. But with the volume...
In the Services property, you tell the API that here's a capability to use. Conversely, the app instance is used to actually use it. So you can use the app instance to set up routing:C# Copy app.MapGet("/", () => "Hello World!"); You can also use app instance to add ...
@@SPID: this built-in function is now supported with natively compiled T-SQL modules, as well as constraints in memory-optimized table.Support with memory-optimized tables for: NULLable index key columns. It is now allowed to include NULLable columns in the keys o...
modelBuilder .Entity<Employee>() .ToTable( "Employees", b => b.IsTemporal( b => { b.HasPeriodStart("ValidFrom"); b.HasPeriodEnd("ValidTo"); b.UseHistoryTable("EmployeeHistoricalData"); })); This is reflected in the table created by SQL Server:SQL...