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How to escape single quotes within single quoted strings
...Quotes and escaping: ANSI C like strings on bash-hackers.org wiki for more details. Also note that "Bash Changes" file (overview here) mentions a lot for changes and bug fixes related to the $'string' quoting mechanism.
According to unix.stackexchange.com How to use a special character as a normal ...
How to change max_allowed_packet size
... problem modifying this for me so I thought I would expand this in greater detail for linux users:
1) open terminal
2) ssh root@YOURIP
3) enter root password
4) nano /etc/mysql/my.cnf (if command is not recognized do this first or try vi then repeat: yum install nano )
5) add the line: max_all...
Calling async method synchronously
...st mindlessly add .ConfigureAwait(false) after all your async calls! For a detailed analysis on why and when you should use .ConfigureAwait(false), see the following blog post:
.NET Blog: ConfigureAwait FAQ
share
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C++11 emplace_back on vector?
... a few corner-cases in my code where I do that, but only in implementation details).
– underscore_d
Jun 25 '18 at 19:27
...
Making heatmap from pandas DataFrame
...ex=index, columns=cols)
df.style.background_gradient(cmap='Blues')
For detailed usage, please see the more elaborate answer I provided on the same topic previously and the styling section of the pandas documentation.
sha...
How to create a generic array in Java?
... because it is potentially dangerous, and should be used with caution. As detailed in the comments, this Object[] is now masquerading as our E[] type, and can cause unexpected errors or ClassCastExceptions if used unsafely.
As a rule of thumb, this behavior is safe as long as the cast array is use...
How to manage a redirect request after a jQuery Ajax call
...ave probably just bound to ajaxError instead. See my answer below for more details.
– Bretticus
Aug 4 '10 at 18:42
2
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User recognition without cookies or local storage
...obability Format and why Joint Probability might be a better approach. The details are too much to get into here (which is why I'm giving you links), but a good example would be a Medical Diagnosis Wizard Application, which uses a combination of symptoms to identify possible diseases.
Think for a m...
Efficiency of Java “Double Brace Initialization”?
...oblems in your application, which I've just recently blogged about in more detail here.
1. You're creating way too many anonymous classes
Each time you use double brace initialisation a new class is made. E.g. this example:
Map source = new HashMap(){{
put("firstName", "John");
put("lastN...
Retrieving the last record in each group - MySQL
...he join)
3 ways MySQL uses indexes is a great article to understand some details.
Solution 1
This one is incredibly fast, it takes about 0,8 secs on my 18M+ rows:
SELECT test_id, MAX(request_id) AS request_id
FROM testresults
GROUP BY test_id DESC;
If you want to change the order to ASC, put ...