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How can I copy data from one column to another in the same table?
...ork if you want to transfer old value to other column and update the first one: UPDATE table SET columnA = 'new value', columnB = columnA. Like other answer says - don't forget the WHERE clause to update only what's needed.
– Carl di Ortus
Feb 9 '18 at 8:45
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Should I use pt or px?
What is the difference between pt and px in CSS? Which one should I use and why?
5 Answers
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Best practices/performance: mixing StringBuilder.append with String.concat
...] array that grows when needed. No extra char[] is created if the internal one is sufficiently big.
stringBuilder.append(s1.concat(s2))
is also performing poorly because s1.concat(s2) creates an extra char[] array and copies s1 and s2 to it just to copy that new array contents to internal StringB...
Java optional parameters
...or explain the serious disadvantage caused by the possibility of more than one return value.
– Andreas Vogl
Dec 26 '19 at 11:05
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On design patterns: When should I use the singleton?
...that there are actually very few "acceptable" reasons to use a Singleton.
One reason that tends to come up over and over again on the internets is that of a "logging" class (which you mentioned). In this case, a Singleton can be used instead of a single instance of a class because a logging class u...
What's the difference between ng-model and ng-bind
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ng-bind has one-way data binding ($scope --> view). It has a shortcut {{ val }}
which displays the scope value $scope.val inserted into html where val is a variable name.
ng-model is intended to be put inside of form elements and has...
How to apply multiple transforms in CSS?
Using CSS, how can I apply more than one transform ?
7 Answers
7
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Sticky and NON-Sticky sessions
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When your website is served by only one web server, for each client-server pair, a session object is created and remains in the memory of the web server. All the requests from the client go to this web server and update this session object. If some data needs t...
How to pass an object from one activity to another on Android
I am trying to work on sending an object of my customer class from one Activity and display it in another Activity .
3...
Undo working copy modifications of one file in Git?
...ied a bunch of files in my working copy, but I want to undo the changes to one of those files, as in reset it to the same state as the most recent commit.
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