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Difference between Key, Primary Key, Unique Key and Index in MySQL
...' records are held. This is very similar to how we, humans, go through a phone book directory to find someone by the last name: We don't start searching through the directory from cover to cover, as long we inserted the information in some order that we can use to skip quickly to the 'S' pages.
Pri...
Spring Data: “delete by” is supported?
...Atapin Downvote because it is no longer a good answer. Maybe delete it ? One of stackoverflows flaws is handling version changes / bugfixes associated with libraries in question.
– Ben George
Jan 15 '15 at 15:35
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what is the basic difference between stack and queue?
...aper. The last piece put into the stack is on the top, so it is the first one to come out. This is LIFO. Adding a piece of paper is called "pushing", and removing a piece of paper is called "popping".
Imagine a queue at the store. The first person in line is the first person to get out of lin...
Is it good style to explicitly return in Ruby?
...trived example, but imagine having a little function like this, which adds one to the number passed, and assigns it to an instance variable.
def plus_one_to_y(x)
@y = x + 1
end
Was this meant to be a function that returned a value, or not? It's really hard to say what the developer meant, a...
Emacs on Mac OS X Leopard key bindings
... here are the key bindings, for moving around text:
⌥ + ← - move left one word
⌥ + → - move right one word
⌥ + delete - back delete one word
Shift + ⌥ + delete - foward delete one word
⌥ + ↑ - move up one paragraph
⌥ + ↓ - move down one paragraph
⌘ + ← - move to start of cur...
What is the difference between a process and a thread?
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@greg, one doubt I have in threads. let me consider I have a process A, which got some space in RAM. If the process A creates a thread, the thread also need some space to execute. So will it increase size of the space which is creat...
How to change the commit author for one specific commit?
I want to change the author of one specific commit in the history. It's not the last commit.
19 Answers
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Rails: Using build with a has_one association in rails
...later on create a profile for that user. I tried using build with a has_one association but that blew up. The only way I see this working is using has_many . The user is supposed to only have at most one profile .
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
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This creates four count columns, but how to get only one? (The question asks for "an additional column" and that's what I would like too.)
– Jaan
Jul 22 '15 at 6:58
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How to exit a 'git status' list in a terminal?
...id ask for me to type yes or no. I pressed q, esc and many other keys and none of them worked until I can across CTRL + C and it got me out of it!
– Mohammed Mishal
May 7 at 22:12
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