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What is Java String interning?
...same memory. So if you have list of names where 'john' appears 1000 times, by interning you ensure only one 'john' is actually allocated memory.
This can be useful to reduce memory requirements of your program. But be aware that the cache is maintained by JVM in permanent memory pool which is usual...
Unfortunately MyApp has stopped. How can I solve this?
...oblem.
You only need to find out what exactly made your application crash, by analyzing the stack trace.
Read up on stack traces in "What is a stack trace, and how can I use it to debug my application errors?"
I still can't solve my problem!
If you've found your Exception and the line where it oc...
What are .NET Assemblies?
...
In more simple terms: A chunk of (precompiled) code that can be executed by the .NET runtime environment. A .NET program consists of one or more assemblies.
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MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
...NNER JOIN sometable st2 ON (st1.relevant_field = st2.relevant_field)
GROUP BY st1.id /* list a unique sometable field here*/
HAVING COUNT(*) > 1
I think st2.relevant_field must be in the select, because otherwise the having clause will give an error, but I'm not 100% sure
Never use IN with a ...
Average of 3 long integers
...aged semantics of the modulo operation, this can give a result that is off by one, namely rounded up rather than down, if negative values for the variables are allowed. For instance if x,y are positive multiples of 3, and z is -2, you get (x+y)/3 which is too much.
– Marc van L...
Selecting pandas column by location
I'm simply trying to access named pandas columns by an integer.
5 Answers
5
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Select parent element of known element in Selenium
...e straightforward.
JavaScript:
WebElement myElement = driver.findElement(By.id("myDiv"));
WebElement parent = (WebElement) ((JavascriptExecutor) driver).executeScript(
"return arguments[0].parentNode;", myElement);
XPath:
WebElement myElement = driver.findElem...
Pseudo-terminal will not be allocated because stdin is not a terminal
...ven if stdin isn't a terminal.
See also: Terminating SSH session executed by bash script
From ssh manpage:
-T Disable pseudo-tty allocation.
-t Force pseudo-tty allocation. This can be used to execute arbitrary
screen-based programs on a remote machine, which can be very usef...
What is the difference between SQL, PL-SQL and T-SQL?
...ry language to operate on sets.
It is more or less standardized, and used by almost all relational database management systems: SQL Server, Oracle, MySQL, PostgreSQL, DB2, Informix, etc.
PL/SQL is a proprietary procedural language used by Oracle
PL/pgSQL is a procedural language used by PostgreSQL
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List all developers on a project in Git
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(users that have done commits)
Note: by default git shortlog groups commits by authors.
If you need to group them by committers, you will need Git 2.12 (Q1 2017)
git shortlog -snc
See commit 03f4082 (16 Dec 2016) by Jeff King (peff).
See commit fbfda15 (11 O...