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SQL SELECT speed int vs varchar
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Int comparisons are faster than varchar comparisons, for the simple fact that ints take up much less space than varchars.
This holds true both for unindexed and indexed access. The fastest way to go is an indexed int column....
boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
...创建一些结构：
// 课程
struct Course
{
unsigned int course_num; // 课程编号
unsigned int course_hour; // 课时
std::string course_name; // 课程名
// 课程枚举
enum CourseNum_Enum
{
Cours...
Install a .NET windows service without InstallUtil.exe
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Here is a class I use when writing services. I usually have an interactive screen that comes up when the service is not called. From there I use the class as needed. It allows for multiple named instances on the same machine -hence the InstanceID field
Sample Call
IntegratedService...
How dangerous is it to compare floating point values?
...th scanf or strtod, do not exist as floating point values and get silently converted to the nearest approximation. This is what demon9733's answer was talking about.
The fact that many results get rounded due to not having enough precision to represent the actual result. An easy example where you ca...
Create a pointer to two-dimensional array
I need a pointer to a static 2-dimensional array. How is this done?
10 Answers
10
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How to parse float with two decimal places in javascript?
... Use var twoPlacedFloat = + parseFloat(yourString).toFixed(2) to convert to float
– Jose Rui Santos
Jul 23 '14 at 10:52
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Is it possible to for SQL Output clause to return a column not being inserted?
...ons) taking the data from the original table (Practice), and fill a second intermediate table (PracticeReportOption).
2 Ans...
What exactly is an “open generic type” in .NET? [duplicate]
...lt;T,U> are all open types (T and U are type arguments) whereas List<int> and Dictionary<string,int> are closed types.
There's a related concept: An unbound generic type is a generic type with unspecified type arguments. An unbound type can't be used in expressions other than typeof()...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
...exes
for every candidate anyway.
The simplest solution to this is to just internally store strings in case folded form and do binary comparisons with case folded candidates. Then you can
move the cursor correctly with just .Length since the cursor is for internal representation. You also get most o...
Split a collection into `n` parts with LINQ?
Is there a nice way to split a collection into n parts with LINQ?
Not necessarily evenly of course.
19 Answers
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