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Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
...ou create new ArrayList, which is a full, independent copy of the original one. Although here you create the wrapper using Arrays.asList as well, it is used only during the construction of the new ArrayList and is garbage-collected afterwards. The structure of this new ArrayList is completely indepe...
How do I find duplicate values in a table in Oracle?
...by COUNT, then use a HAVING clause to find values that appear greater than one time.
SELECT column_name, COUNT(column_name)
FROM table_name
GROUP BY column_name
HAVING COUNT(column_name) > 1;
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Diff output from two programs without temporary files
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Use <(command) to pass one command's output to another program as if it were a file name. Bash pipes the program's output to a pipe and passes a file name like /dev/fd/63 to the outer command.
diff <(./a) <(./b)
Similarly you can use >(...
Parse a URI String into Name-Value Collection
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You are forgetting to decode the names and parameters, one reason why it's usually better to let libraries do common tasks.
– Juan Mendes
Nov 27 '12 at 20:52
10...
How do I keep CSS floats in one line?
I want to have two items on the same line using float: left for the item on the left.
10 Answers
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What is Unicode, UTF-8, UTF-16?
...d were a few control characters, punctuation, numbers and letters like the ones in this sentence. Unfortunately, today's strange world of global intercommunication and social media was not foreseen, and it is not too unusual to see English, العربية, 汉语, עִבְרִית, ελληνικά,...
Why does Double.NaN==Double.NaN return false?
...n described, NaN is unordered, so a numeric comparison operation involving one or two NaNs returns false and any != comparison involving NaN returns true, including x!=x when x is NaN.
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Purpose of Unions in C and C++
...g of the rooms (i.e. by making sure different people don't get assigned to one room at the same time), a relatively small hotel can provide accommodations to a relatively large number of people, which is what hotels are for.
That's exactly what union does. If you know that several objects in your p...
ggplot with 2 y axes on each side and different scales
...ed to plot a bar chart showing counts and a line chart showing rate all in one chart, I can do both of them separately, but when I put them together, I scale of the first layer (i.e. the geom_bar ) is overlapped by the second layer (i.e. the geom_line ).
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Postgresql GROUP_CONCAT equivalent?
I have a table and I'd like to pull one row per id with field values concatenated.
7 Answers
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