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Unioning two tables with different number of columns
I have two tables (Table A and Table B).
5 Answers
5
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memcpy() vs memmove()
I am trying to understand the difference between memcpy() and memmove() , and I have read the text that memcpy() doesn't take care of the overlapping source and destination whereas memmove() does.
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How to set or change the default Java (JDK) version on OS X?
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First run /usr/libexec/java_home -V which will output something like the following:
Matching Java Virtual Machines (3):
1.8.0_05, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home
1.6.0_65-b14-462, x86_64: ...
Printing everything except the first field with awk
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Assigning $1 works but it will leave a leading space: awk '{first = $1; $1 = ""; print $0, first; }'
You can also find the number of columns in NF and use that in a loop.
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What is meant by 'first class object'?
... other things, the aspect of JavaScript where functions are 'first class' objects. What does the 'first class' mean in this context, as opposed to other objects?
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Should I implement __ne__ in terms of __eq__ in Python?
...It seems to make sense that I should override the __ne__ method as well, but does it make sense to implement __ne__ in terms of __eq__ as such?
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How to sort List of objects by some property
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Either make ActiveAlarm implement Comparable<ActiveAlarm> or implement Comparator<ActiveAlarm> in a separate class. Then call:
Collections.sort(list);
or
Collections.sort(list, comparator);
In general, it's a good idea to implement Comparable<T&...
Numpy index slice without losing dimension information
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It's probably easiest to do x[None, 10, :] or equivalently (but more readable) x[np.newaxis, 10, :].
As far as why it's not the default, personally, I find that constantly having arrays with singleton dimensions gets annoying very ...
Java Generics: Cannot cast List to List? [duplicate]
Just come across with this problem:
10 Answers
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Difference between partition key, composite key and clustering key in Cassandra?
I have been reading articles around the net to understand the differences between the following key types. But it just seems hard for me to grasp. Examples will definitely help make understanding better.
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