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Java Enum Methods - return opposite direction enum
...l as flexible as first approach since adding more fields or changing their order will break our code.
public enum Direction {
NORTH, EAST, SOUTH, WEST;
// cached values to avoid recreating such array each time method is called
private static final Direction[] VALUES = values();
pu...
How to get a list of repositories apt-get is checking? [closed]
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Did someone enhance the output (summarizing urls etc) and want to share his command here?
– lony
Apr 18 '17 at 12:30
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Finding duplicate values in a SQL table
...s unpredictable and you need sql_mode=only_full_group_by:
GROUP BY lname ORDER BY showing wrong results;
Which is the least expensive aggregate function in the absence of ANY() (see comments in accepted answer).
Oracle isn't mainstream enough (warning: humour, I don't know about Oracle).
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Command to list all files in a folder as well as sub-folders in windows
...re format (no heading information or summary).
/O List by files in sorted order.
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What does the 'b' character do in front of a string literal?
...ing.
But also used to represent binary data like struct.pack output.
In order to ease the 2.x-to-3.x transition, the b'...' literal syntax was backported to Python 2.6, in order to allow distinguishing binary strings (which should be bytes in 3.x) from text strings (which should be str in 3.x). ...
Java LinkedHashMap get first or last entry
I have used LinkedHashMap because it is important the order in which keys entered in the map.
14 Answers
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When do we have to use copy constructors?
...ly, this is cached/memoized data accumulated over the object's lifetime in order to speed-up certain slow query operations performed by the object. It is safe to skip copying that data since it will be recalculated when (and if!) the relevant operations are performed. Copying this data may be unjust...
How to set up a Subversion (SVN) server on GNU/Linux - Ubuntu [closed]
...pache2-utils apache2.2-common
2: Enable SSL
sudo a2enmod ssl
sudo kate /etc/apache2/ports.conf
Add or check that the following is in the file:
<IfModule mod_ssl.c>
Listen 443
</IfModule>
3: Generate an SSL certificate:
sudo apt-get install ssl-cert
sudo mkdir /etc/apache2/ss...
How do I create a list of random numbers without duplicates?
...ignificantly cheaper. For ranges of size N, if you want to generate on the order of N unique k-sequences or more, I recommend the accepted solution using the builtin methods random.sample(range(N),k) as this has been optimized in python for speed.
Code
# Return a randomized "range" using a Linear Co...
Multiple INSERT statements vs. single INSERT with multiple VALUES
...ried a query consisting entirely of duplicate rows and neither affects the order of the output of the table of the constants (and as you are inserting into a heap time spent sorting would be pointless anyway even if it did).
Moreover if a clustered index is added to the table the plan still shows ...