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Select first row in each GROUP BY group?
... If there are multiple purchases with equally the highest total for one customer, the 1st query returns an arbitrary winner (depending on implementations details; the id can change for every execution!). Typically (not always) you would want one row per customer, defined by additional criteri...
Spring vs EJB. Can Spring replace EJB? [closed]
...B . For me, Spring is able to replace the requirement of using EJB. Can anyone tell me what are the extra advantages of using EJB?
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Download multiple files with a single action
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HTTP does not support more than one file download at once.
There are two solutions:
Open x amount of windows to initiate the file downloads (this would be done with JavaScript)
preferred solution create a script to zip the files
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How to specify an element after which to wrap in css flexbox? [duplicate]
...ise, starting from the first uncollected item, collect
consecutive items one by one until the first time that the next
collected item would not fit into the flex container’s inner main
size, or until a forced break is encountered. If the very first
uncollected item wouldn’t fit, collect ...
How to convert/parse from String to char in java?
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If your string contains exactly one character the simplest way to convert it to a character is probably to call the charAt method:
char c = s.charAt(0);
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java.util.regex - importance of Pattern.compile()?
...rn object. So the question is really, why should you call it explicitly? One reason is that you need a reference to the Matcher object so you can use its methods, like group(int) to retrieve the contents of capturing groups. The only way to get ahold of the Matcher object is through the Pattern o...
Static/Dynamic vs Strong/Weak
... both and actually spells out the difference. What would be nice is if someone could please spell this out clearly here for me and the rest of the world.
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How do you express binary literals in Python?
...ary format with a 0 followed by a B or b followed by a series of zeros and ones, for example:
>>> 0b0010101010
170
>>> 0B010101
21
From the Python 3 docs, these are the ways of providing integer literals in Python:
Integer literals are described by the following lexical defi...
In which language are the Java compiler and JVM written?
... "the JVM" or "the compiler" as there are multiple JVM vendors (jrockit is one, IBM another) and multiple compilers out there.
The Sun JVM is written in C, although this need not be the case - the JVM as it runs on your machine is a platform-dependent executable and hence could have been original...
How to use Comparator in Java to sort
...ss as a plural of something, it suggests it is an abstraction of more than one thing.
Anyway, here's a demo of how to use a Comparator<T>:
public class ComparatorDemo {
public static void main(String[] args) {
List<Person> people = Arrays.asList(
new Pers...