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Java: Integer equals vs. ==
... cdsCt were both ints so this was fine, but I had to make them Integers in order to check for the null situation which is handled differently ...
– Jeremy Goodell
Sep 3 '10 at 17:40
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How to split a delimited string in Ruby and convert it to an array?
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MySQL Query GROUP BY day / month / year
... that return non-string value for SQL comparison condition (WHERE, HAVING, ORDER BY, GROUP BY).
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Initial size for the ArrayList
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if you want to use Collections.fill(list, obj); in order to fill the list with a repeated object alternatively you can use
ArrayList<Integer> arr=new ArrayList<Integer>(Collections.nCopies(10, 0));
the line copies 10 times 0 in to your ArrayList
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How to install the JDK on Ubuntu Linux
...lete, set environment variables as follows.
Edit the system path in file /etc/profile:
sudo gedit /etc/profile
Add the following lines at the end.
JAVA_HOME=/usr/lib/jvm/jdk1.7.0
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH
Source: http://javaandme.com/
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Python function as a function argument?
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hello dude
world
Note that function, *args, **kwargs have to be in that order and have to be the last arguments to the function calling the function.
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Limitations of SQL Server Express
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count the frequency that a value occurs in a dataframe column
... 2
b 3
s 2
With df.a.value_counts() sorted values (in descending order, i.e. largest value first) are returned by default.
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What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?
...ces for Writing Dockerfiles
Because image size matters, using ADD to fetch packages from remote URLs is strongly discouraged; you should use curl or wget instead. That way you can delete the files you no longer need after they've been extracted and you won't have to add another layer in your im...
Delete duplicate rows from small table
... ROW_NUMBER() OVER (partition BY column1, column2, column3 ORDER BY id) AS rnum
FROM tablename) t
WHERE t.rnum > 1);
provided by Postgres wiki:
https://wiki.postgresql.org/wiki/Deleting_duplicates
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