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c# - How do I most elegantly express left join with aggregate SQL as LINQ query

c# - How do I most elegantly express left join with aggregate SQL as LINQ query

SQL: SELECT u.id, u.name, isnull(MAX(h.dateCol), '1900-01-01') dateColWithDefault FROM universe u LEFT JOIN history h ON u.id=h.id AND h.dateCol<GETDATE()-1 GROUP BY u.Id, u.name…


java - IllegalArgumentException or NullPointerException for a null parameter?

Closed.This question is opinion-based.It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by…



c# - ConfigurationManager.AppSettings Performance Concerns

I plan to be storing all my config settings in my application's app.config section(using the ConfigurationManager.AppSettings class). As the user changes settings using the app's UI(clicking checkb…


SQL Case Expression Syntax?

What is the complete and correct syntax for the SQL Case expression?…


vb.net - IsNothing versus Is Nothing

Does anyone here use VB.NET and have a strong preference for or against using IsNothing as opposed to Is Nothing(for example, If IsNothing(anObject) or If anObject Is Nothing...)? If so, why? EDIT: If…


Difference between NULL and null in PHP

Is there a difference between NULL and null in PHP? Sometimes they seem to be interchangeable and sometimes not. edit: for some reason when I read the documentation linked to in the answer(before pos…


Checking for string contents? string Length Vs Empty String

Which is more efficient for the compiler and the best practice for checking whether a string is blank? Checking whether the length of the string== 0 Checking whether the string is empty(strVar==…


C# Database Access: DBNull vs null

We have our own ORM we use here, and provide strongly typed wrappers for all of our db tables. We also allow weakly typed ad-hoc SQL to be executed, but these queries still go through the same class…


c# - Validate Enum Values

I need to validate an integer to know if is a valid enum value. What is the best way to do this in C#?…


How do I get rid of Home in ASP.Net MVC?

I know this site is written using ASP.Net MVC and I do not see "/Home" in the url. This proves to me that it can be done. What special route and do I need?…




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