大约有 40,000 项符合查询结果（耗时：0.0455秒） [XML]
Does Foreign Key improve query performance?
...se I have 2 tables, Products and ProductCategories. Both tables have relationship on CategoryId. And this is the query.
9 A...
How do I view cookies in Internet Explorer 11 using Developer Tools
...or how to view the cookies set using developer tools in IE11. I see an option in network profiling to view cookies being sent back and forth, but this is not really the same thing. It is cumbersome to use since it's per request. Surely there must be a way to view all cookies like you can in IE10.
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How do I escape a single quote in SQL Server?
... you've shown us in your example. The following SQL illustrates this functionality. I tested it on SQL Server 2008:
DECLARE @my_table TABLE (
[value] VARCHAR(200)
)
INSERT INTO @my_table VALUES ('hi, my name''s tim.')
SELECT * FROM @my_table
Results
value
==================
hi, my name's t...
Click button copy to clipboard using jQuery
...d to add a link which will add the text to the clipboard. Is there a solution for this?
21 Answers
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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
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It depends. See the MySQL Performance Blog post on this subject: To SQL_CALC_FOUND_ROWS or not to SQL_CALC_FOUND_ROWS?
Just a quick summary: Peter says that it depends on your indexes and other factors. Many of the comments to the post seem to say that SQL_CALC_FOUND_ROW...
Is there a .NET/C# wrapper for SQLite? [closed]
...m within C#.Net, but I can't seem to find an appropriate library. Is there one? An official one? Are there other ways to use SQLite than with a wrapper?
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Algorithm to find top 10 search terms
I'm currently preparing for an interview, and it reminded me of a question I was once asked in a previous interview that went something like this:
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what is faster: in_array or isset? [closed]
This question is merely for me as I always like to write optimized code that can run also on cheap slow servers (or servers with A LOT of traffic)
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Why do pthreads’ condition variable functions require a mutex?
I’m reading up on pthread.h ; the condition variable related functions (like pthread_cond_wait(3) ) require a mutex as an argument. Why? As far as I can tell, I’m going to be creating a mutex just to use as that argument? What is that mutex supposed to do?
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Xcode 4.2 debug doesn't symbolicate stack call
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However, I have found an effective work-around - creating my own exception handler (which is also useful for other reasons). First, create a function that will handle the error and output it to the console (as well as whatever else you want to do with it):
void uncaughtExceptionHandler(NSExcepti...