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How to count occurrences of a column value efficiently in SQL?
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SELECT age, count(age)
FROM Students
GROUP by age
If you need the id as well you could include the above as a sub query like so:
SELECT S.id, S.age, C.cnt
FROM Students S
INNER JOIN (SELECT age, count(age) as cnt
FROM Students
GROUP BY ag...
List files ONLY in the current directory
In Python, I only want to list all the files in the current directory ONLY. I do not want files listed from any sub directory or parent.
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In C, how should I read a text file and print all strings
I have a text file named test.txt
7 Answers
7
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How to delete a file after checking whether it exists
How can I delete a file in C# e.g. C:\test.txt , although apply the same kind of method like in batch files e.g.
10 Answer...
Find current directory and file's directory [duplicate]
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To get the full path to the directory a Python file is contained in, write this in that file:
import os
dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working ...
How to transfer some data to another Fragment?
...lass implements Serializable {
private static final long serialVersionUID = -2163051469151804394L;
private int id;
private String created;
}
In you FromFragment:
Bundle args = new Bundle();
args.putSerializable(TAG_MY_CLASS, myClass);
Fragment toFragment = new ToFragment();
toFragment...
Git command to show which specific files are ignored by .gitignore
... in "Is there a way to tell git-status to ignore the effects of .gitignore files?")
MattDiPasquale's answer (to be upvoted) git clean -ndX works on older gits, displaying a preview of what ignored files could be removed (without removing anything)
Also interesting (mentioned in qwertymk's answer...
Lock Android phone application to Portrait mode
...plication to a portrait mode? Is it a simple configuration in the manifest file?
4 Answers
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About “*.d.ts” in TypeScript
...se I'm a newbie in TypeScript. And I was told by someone that this kind of file is something like "head file" in C++ but for JS only. But I cannot convert a pure JS file to *.d.ts file unless I forcely change the *.js to *.ts . So I have three files:
a JS file, a TS file and a *.d.ts file.
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How to loop through file names returned by find?
...ove piece of code in Bash shell, what I get is a string containing several file names separated by blank, not a list.
13 An...