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MySQL: Quick breakdown of the types of joins [duplicate]
...planation of the join type
JOIN: Return rows when there is at least one match in both tables
LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table
RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table
F...
Prevent direct access to a php include file
...he question clearly, then it is a good answer. Providing an example where none is needed only encourages copy-and-paste coding.
– Chuck
Sep 10 '13 at 21:03
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No connection could be made because the target machine actively refused it?
...ages and platforms have basically the same API in this regard, even the C# one. This parameter is often configurable if you control the server, and is likely read from some settings file or the registry. Investigate how to configure your server.
If you wrote the server, you might have heavy proce...
Why does Math.Round(2.5) return 2 instead of 3?
...urn ValueType: System.DoubleThe integer nearest a. If the
fractional component of a is halfway
between two integers, one of which is
even and the other odd, then the even
number is returned. Note that this
method returns a Double instead of an
integral type.
RemarksThe behavior of t...
Templated check for the existence of a class member function?
...E test
template <typename T>
class has_helloworld
{
typedef char one;
struct two { char x[2]; };
template <typename C> static one test( decltype(&C::helloworld) ) ;
template <typename C> static two test(...);
public:
enum { value = sizeof(test<T>...
JavaScript function in href vs. onclick
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The one time I would advocate for putting the function call inline vs. having an onclick event for the link is if you are dynamically creating links within the page that will all call the same function but may not have unique ids...
What is a loop invariant?
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There is one thing that many people don't realize right away when dealing with loops and invariants. They get confused between the loop invariant, and the loop conditional ( the condition which controls termination of the loop ).
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MySQL: How to copy rows, but change a few fields?
...ave a large number of rows that I would like to copy, but I need to change one field.
6 Answers
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How does the Windows Command Interpreter (CMD.EXE) parse scripts?
... <0x0C> and <0xFF>
Consecutive token delimiters are treated as one - there are no empty tokens between token delimiters
There are no token delimiters within a quoted string. The entire quoted string is always treated as part of a single token. A single token may consist of a combination ...
Converting a Java collection into a Scala collection
...
For future reference: With Scala 2.8, it could be done like this:
import scala.collection.JavaConversions._
val list = new java.util.ArrayList[String]()
list.add("test")
val set = list.toSet
set is a scala.collection.immutable.Set[String] after this.
Also see Ben James' a...