SQL Server- Union and Union All

A good link which explains this topic with simple example;

Comments

Post a Comment

Popular posts from this blog

DDoS Attack for Distributed Microservices

A Distributed Denial-of-Service (DDoS) attack is a malicious attempt to disrupt the normal traffic of a targeted server, service or network by overwhelming the target or its surrounding infrastructure with a flood of Internet traffic. DDoS attacks achieve effectiveness by utilizing multiple compromised computer systems as sources of attack traffic. Exploited machines can include computers and other networked resources such as IoT devices.  DDoS attacks are carried out with networks of Internet-connected machines. These networks consist of computers and other devices (such as IoT devices) which have been infected with malware, allowing them to be controlled remotely by an attacker. These individual devices are referred to as bots (or zombies), and a group of bots is called a botnet . Once a botnet has been established, the attacker is able to direct an attack by sending remote instructions to each bot. When a victim’s server or network is targeted by the botnet, each bot sends requ...
Read more

Message Headers for WCF Request

Often do we want to pass some data to some or maybe all our service operations. This data is usually context data such as user tokens (user information), or environmental preferences of the user or machine (in Respond terminology: UserConext object). In these kind of situations, we would rather not add additional context parameters to the contracts or our services, because we don’t want to involve implementation data / context data with the business parameters of our services. A nice and easy way to pass that data is to use MessageHeaders. In order to do this we follow these steps: Add the context data to the outgoing message headers. Call the operation (Nothing special here). Extract the data from the incoming message headers. Using an OperationContextScope In order to add the message header, you should have a OperationContext for your call. An OperationContext will automaticly be created for the call, and will be available in the service side. If one wishes to add the message he...
Read more

ASP.NET Core with Kestrel Webserver

The 1st question comes to my mind when I hear about another new webserver like IIS for .NET applications. Why do we need this new webserver called 'Kestrel'? As we all know Asp.Net Core is primarily to make Asp.Net Core applications to run across multiple platforms (Windows/Unix/Linux/MAC OS). Even though we have IIS with rich in features but mostly used webserver for Windows OS only. Each webserver has a different configurations expected to startup and Kestrel will make Asp.Net Core applications have different Startup mechanisms. This is why Asp.Net Core applications use Kestrel webserver as an in-process server where the application will have same and consistent Startup (Main() and Startup.ConfigireServices() & Startup.Configure()) process even when offering cross platform support. Kestrel is an open source, cross platform, light weight and a default webserver used for Asp.Net Core applications. Asp.Net Core applications run Kestrel webserver as in-process server to ...
Read more