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How do I get SUM function in MySQL to return '0' if no values are found?
...nformation:
Given three tables (one with all numbers, one with all nulls, and one with a mixture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
val INT
);
INSERT INTO foo (val) VALUES
(null),(1),(null),(2),(null),(3),(null),(4),(n...
How to use the IEqualityComparer
...the solution is to forward GetHashCode to Class_reglement.Numf.GetHashCode and implement it appropriately there.
Apart from that, your Equals method is full of unnecessary code. It could be rewritten as follows (same semantics, ¼ of the code, more readable):
public bool Equals(Class_reglement x, ...
Static Indexers?
... indexers disallowed in C#? I see no reason why they should not be allowed and furthermore they could be very useful.
7 Ans...
How to wait for all goroutines to finish without using time.Sleep?
...s code selects all xml files in the same folder, as the invoked executable and asynchronously applies processing to each result in the callback method (in the example below, just the name of the file is printed out).
...
How to increase the Java stack size?
...crease the runtime call stack size in the JVM. I've got an answer to this, and I've also got many useful answers and comments relevant to how Java handles the situation where a large runtime stack is needed. I've extended my question with the summary of the responses.
...
Getting the name of the currently executing method
... edited Mar 14 '19 at 22:31
RAnders00
4,20144 gold badges2929 silver badges5757 bronze badges
answered Jan 14 '09 at 12:29
...
What is the difference between the $parse, $interpolate and $compile services?
...ing the $interpolate provider to render our template against an Object and convert it into DOM nodes."
– Nadav Lebovitch
Aug 14 '14 at 18:27
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C++ Modules - why were they removed from C++0x? Will they be back later on?
...arate TR:"
These topics are deemed too important to wait for another standard after C++0x before being published, but too experimental to be finalised in time for the next Standard. Therefore, these features will be delivered by a technical report at the earliest opportunity.
The modules propo...
Benefits of using the conditional ?: (ternary) operator
What are the benefits and drawbacks of the ?: operator as opposed to the standard if-else statement. The obvious ones being:
...
What is the difference between IEqualityComparer and IEquatable?
I want to understand the scenarios where IEqualityComparer<T> and IEquatable<T> should be used.
The MSDN documentation for both looks very similar.
...