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Is it possible to GROUP BY multiple columns using MySQL?
...erence of left to right is applied to the ascending order of the groupings and not the column group preference. GROUP BY applies col1+col2. e.g. col1 = 1, 2, 1, 2 | col2 = 1, 2, 3, 2 and running GROUP BY col1,col2 would return 1,1|1,3|2,2 as opposed to 1,1|2,2 as suggested. Whereas GROUP BY col2, co...
What are sessions? How do they work?
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@Gab是好人 REFERRER usually means an arbitrary string that the client sends in the "Referer" HTTP request header. It should contain the URL of the resource that, you know, referred the client to the current resource.
– Luke404
Aug 8 ...
Do I need to heartbeat to keep a TCP connection open?
...s that that communicate via TCP/IP. Component A acts as a server/listener and Component B is the client. The two should communicate as quickly as possible. There can only ever be one connection at any time (though that is aside to this question). A senior developer at my company has said I need ...
Downloading MySQL dump from command line
...he contents of a MySQL database. Is there a way I can do this from the command line?
13 Answers
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performing HTTP requests with cURL (using PROXY)
...erver:port/
Then you can connect through proxy from (many) application.
And, as per comment below, for https:
export https_proxy=https://your.proxy.server:port/
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ansible: lineinfile for several lines?
...ame: Set first line at EOF (1/3)
lineinfile: dest=/path/to/file regexp="^string 1" line="string 1"
- name: Set second line after first (2/3)
lineinfile: dest=/path/to/file regexp="^string 2" line="string 2" insertafter="^string 1"
- name: Set third line after second (3/3)
lineinfile: dest=/pat...
Share application “link” in Android
... shareIntent.putExtra(Intent.EXTRA_SUBJECT, "My application name");
String shareMessage= "\nLet me recommend you this application\n\n";
shareMessage = shareMessage + "https://play.google.com/store/apps/details?id=" + BuildConfig.APPLICATION_ID +"\n\n";
shareIntent.putExtra(Intent.EXTR...
What are the differences between WCF and ASMX web services?
...and understand for the most common web service needs). WCF adds a lot of extra complexity. While MS wants to replace ASMX with WCF, there seems to be a bit of resistance to it until MS makes the most common scenarios as simple as the old [Webmethod] way.
– mattmc3
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Command line for looking at specific port
...In bash:
netstat -na | grep "8080"
In PowerShell:
netstat -na | Select-String "8080"
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What is a “thread” (really)?
I have been trying to find a good definition, and get an understanding, of what a thread really is.
10 Answers
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