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Real life example, when to use OUTER / CROSS APPLY in SQL
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Some uses for APPLY are...
1) Top N per group queries (can be more efficient for some cardinalities)
SELECT pr.name,
pa.name
FROM sys.procedures pr
OUTER APPLY (SELECT TOP 2 *
FROM sys.parameters pa
WHERE pa.object_id = ...
Python - write() versus writelines() and concatenated strings
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More specifically, writelines expects an iterable. You can use a list, a tuple, or a generator.
– Mark Ransom
Sep 11 '12 at 20:52
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Declaring abstract method in TypeScript
...blished.
The makeSound method is marked as abstract, as is the class. You cannot directly instantiate an Animal now, because it is abstract. This is part of TypeScript 1.6, which is now officially live.
abstract class Animal {
constructor(protected name: string) { }
abstract makeSound(inp...
How to swap files between windows in VIM?
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Not completely, no. There are lots of use cases that can't be done using the built in window management without destroying and recreating windows. The swap buffers script allows these use cases.
– bobpaul
Oct 12 '11 at 21:10
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how to get the current working directory's absolute path from irb
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Note: this does not return the location of the current file. In order to do that, see the answers below. This only returns the current working directory of the shell which is calling the script (just like pwd), which might be somewhere completely different t...
Platform independent size_t Format specifiers in c?
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Right, so in this case, you should be using %zu, because the argument is unsigned.
– caf
Jan 24 '10 at 23:03
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Bash script - variable content as a command to run
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You just need to do:
#!/bin/bash
count=$(cat last_queries.txt | wc -l)
$(perl test.pl test2 $count)
However, if you want to call your Perl command later, and that's why you want to assign it to a variable, then:
#!/bin/bash
count=$(cat last_queries.txt | wc -l)
v...
What is the difference between `sorted(list)` vs `list.sort()`?
...iterable, not a list yet.
For lists, list.sort() is faster than sorted() because it doesn't have to create a copy. For any other iterable, you have no choice.
No, you cannot retrieve the original positions. Once you called list.sort() the original order is gone.
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How to fix SSL certificate error when running Npm on Windows?
...r security:
Replace existing certs
# Windows/MacOS/Linux
npm config set cafile "<path to your certificate file>"
# Check the 'cafile'
npm config get cafile
or extend existing certs
Set this environment variable to extend pre-defined certs:
NODE_EXTRA_CA_CERTS to "<path to certificate...
What is Hindley-Milner?
...lner are
It supports polymorphic functions; for example, a function that can give you the length of the list independent of the type of the elements, or a function does a binary-tree lookup independent of the type of keys stored in the tree.
Sometimes a function or value can have more than one typ...