大约有 10,700 项符合查询结果（耗时：0.0208秒） [XML]
Mongoose query where value is not null
... is exactly what I was looking for myself, thanks!
– Cacoon
Jan 30 '18 at 10:03
I was struggling to find $not in the a...
Why is conversion from string constant to 'char*' valid in C but invalid in C++
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Up through C++03, your first example was valid, but used a deprecated implicit conversion--a string literal should be treated as being of type char const *, since you can't modify its contents (without causing undefined behavior).
As of C++11, the implicit conversion that had been deprec...
C#: How to convert a list of objects to a list of a single property of that object?
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Thanks. Also, how would I sort that alphabetically by firstname?
– User
Sep 22 '09 at 16:36
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C++ where to initialize static const
...y a .cpp file) would do:
foo.h
class foo {
static const string s; // Can never be initialized here.
static const char* cs; // Same with C strings.
static const int i = 3; // Integral types can be initialized here (*)...
static const int j; // ... OR in cpp.
};
foo.cpp
#incl...
Boolean vs tinyint(1) for boolean values in MySQL
...answer the question. While it's true that tinyint(1) is functionally identical to bool, the OP asked what is best to use. The answer by @dj_segfault does a proper job explaining why bool should be preferred over tinyint(1) when storing a boolean value.
– Kyle Morgan
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What is the difference between “Form Controls” and “ActiveX Control” in Excel 2010?
Using Microsoft Excel 2010, I noticed two kind of controls that can be inserted into a document: Form Controls and ActiveX Controls .
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How do I write LINQ's .Skip(1000).Take(100) in pure SQL?
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In SQL Server 2005 and above you can use ROW_NUMBER function. eg.
USE AdventureWorks;
GO
WITH OrderedOrders AS
(
SELECT SalesOrderID, OrderDate,
ROW_NUMBER() OVER (ORDER BY OrderDate) AS 'RowNumber'
FROM Sales.SalesOrderHeader
)
SELECT *
FROM...
What is NSZombie?
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It's a memory debugging aid. Specifically, when you set NSZombieEnabled then whenever an object reaches retain count 0, rather than being deallocated it morphs itself into an NSZombie instance. Whenever such a zombie receives a message, it logs a warning rather...
Collection that allows only unique items in .NET?
Is there a collection in C# that will not let you add duplicate items to it? For example, with the silly class of
7 Answers...
Should ol/ul be inside or outside?
...egally allowed inside p elements.
To see why, let's go to the spec! If you can get comfortable with the HTML spec, it will answer many of your questions and curiosities. You want to know if an ol can live inside a p. So…
4.5.1 The p element:
Categories: Flow content, Palpable content.
Content mo...