大约有 47,000 项符合查询结果（耗时：0.0461秒） [XML]
How to select unique records by SQL
...
With the distinct keyword with single and multiple column names, you get distinct records:
SELECT DISTINCT column 1, column 2, ...
FROM table_name;
share
|
imp...
Array.Copy vs Buffer.BlockCopy
Array.Copy and Buffer.BlockCopy both do the same thing, but BlockCopy is aimed at fast byte-level primitive array copying, whereas Copy is the general-purpose implementation. My question is - under what circumstances should you use BlockCopy ? Should you use it at any time when you are copyi...
check if directory exists and delete in one command unix
Is it possible to check if a directory exists and delete if it does,in Unix using a single command? I have situation where I use ANT 'sshexec' task where I can run only a single command in the remote machine. And I need to check if directory exists and delete it...
...
How can I list ALL DNS records?
... example, to reduce the size of the response).
An AXFR is a zone transfer and is likely what you want. However, these are typically restricted and not available unless you control the zone. You'll usually conduct a zone transfer directly from the authoritative server (the @ns1.google.com below) and...
What is the difference between sed and awk? [closed]
...is. It has a primitive programming language that includes goto-style loops and simple conditionals (in addition to pattern matching and address matching). There are essentially only two "variables": pattern space and hold space. Readability of scripts can be difficult. Mathematical operations are ex...
How do I install cURL on cygwin?
I tried to enable curl on cygwin but it says bash: curl: command not found
17 Answers
...
WatiN or Selenium? [closed]
... tests of our presentation soon. It seems that everyone recommends WatiN and Selenium . Which do you prefer for automated testing of ASP.NET web forms? Which of these products work better for you?
...
client secret in OAuth 2.0
...e google drive api, I have to play with the authentication using OAuth2.0. And I got a few question about this.
3 Answers
...
undefined reference to boost::system::system_category() when compiling
...do.)
Assuming you use gcc, try adding -lboost_system to your compiler command line in order to link against that library.
share
|
improve this answer
|
follow
...
Measure execution time for a Java method [duplicate]
...ethod involves lots of db transactions ?
– feel good and programming
Aug 18 '15 at 5:49
I do not see why the number of...