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How does database indexing work? [closed]
...the address of the actual record, which requires a further block access to read, bringing the total to 19 + 1 = 20 block accesses, a far cry from the 1,000,000 block accesses required to find a firstName match in the non-indexed table.
When should it be used?
Given that creating an index requires ...
Convert an image (selected by path) to base64 string
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Why even bother resaving it though? you can just read the file's bytes and convert those.
– Nyerguds
Feb 1 '18 at 12:43
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Which one will execute faster, if (flag==0) or if (0==flag)?
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I haven't seen any correct answer yet (and there are already some) caveat: Nawaz did point out the user-defined trap. And I regret my hastily cast upvote on "stupidest question" because it seems that many did not get it right and it gives room for a nice discussion on compiler op...
How to safely open/close files in python 2.4
...ry-finally blocks:
>>> with open('workfile', 'r') as f:
... read_data = f.read()
>>> f.closed
True
More here: https://docs.python.org/2/tutorial/inputoutput.html#methods-of-file-objects
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Difference between GeoJSON and TopoJSON
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And even though I did remember reading about "shared line segments", I still assumed "topo" stood for "topography", which it does not. Here's a nice read about the difference between "topology" and "topography" (the former is the origin of "topo" in topojs...
SAML vs federated login with OAuth
... has been established, and now your app can act as you on Twitter. It can read your posts, as well as make new ones.
SAML - For SAML think of some type of "agreement" between two unrelated membership systems. In our case we can use US Airways and Hertz. There is no shared set of credentials that...
How is the Linux kernel tested ?
... but only reported via /sys/kernel/debug/kmemleak.
Kmemcheck traps every read and write to memory that was allocated dynamically (i.e. with kmalloc()). If a memory address is read that has not previously been written to, a message is printed to the kernel log. Also is a part of Linux Kernel
Fault...
Difference between JOIN and INNER JOIN
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They are functionally equivalent, but INNER JOIN can be a bit clearer to read, especially if the query has other join types (i.e. LEFT or RIGHT or CROSS) included in it.
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Git - How to fix “corrupted” interactive rebase?
...to file, so I created that file. Then I got another error saying could not read '.git/rebase-apply/onto': No such file or directory.
So I looked at the git documentation for rebasing and found another command:
git rebase --quit
This set me back on my branch with no changes, and I could start my ...
getResourceAsStream returns null
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I've already done all three of these things. Please reread my question.
– user1131435
May 15 '13 at 16:51
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