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sql primary key and index
...ten do I also need to index it? Or does it being a primary key mean it's already indexed?
11 Answers
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How do I display an alert dialog on Android?
...lert window pops up and disappears immediately, without letting me time to read it. I obviously don't have time to click on the buttons to dismiss it either. Any idea why?
– lweingart
Jan 6 '16 at 14:33
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IIS Express Windows Authentication
... MyDocuments\IISExpress into account so any customizations will need to be readded.
– Tedford
Aug 23 '15 at 17:35
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show 7 more comments
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Increment a value in Postgres
...lational database. However running the update will not prevent others from reading the old values until your transaction is committed
– a_horse_with_no_name
Sep 17 '15 at 14:49
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Moving project to another folder in Eclipse
...jb's accepted answer works well (in my experience just now), except having read comment by Basic May 14 '12 at 9:27, I tried to add my project XMLDiff to C:...\SVN\trunk\Internal Projects, and I got a failure with the rather cryptic message:
Problems encountered while moving resources.
Resource alr...
Why is pow(a, d, n) so much faster than a**d % n?
...n with Python 2 or 3 than PyPy, when usually PyPy is much faster?
If you read PyPy's performance page, this is exactly the kind of thing PyPy is not good at—in fact, the very first example they give:
Bad examples include doing computations with large longs – which is performed by unoptimiz...
Propagate all arguments in a bash shell script
...st anyone who wants to understand the subject of Word Splitting better, to read more about it here.
– Rany Albeg Wein
Jan 21 '16 at 4:07
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How to do ssh with a timeout in a script?
...TERM if ssh doesn't return after 5 second.
for more details about timeout, read this document：
http://man7.org/linux/man-pages/man1/timeout.1.html
or you can use the param of ssh:
ssh -o ConnectTimeout=3 user@ip
share
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Why am I suddenly getting a “Blocked loading mixed active content” issue in Firefox?
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However, if an HTTPS page includes HTTP content, the HTTP portion can be read or modified by attackers, even though the main page is served over HTTPS. When an HTTPS page has HTTP content, we call that content “mixed”. The webpage that the user is visiting is only partially encrypted, since s...
How to achieve code folding effects in Emacs?
... "foo" mentioned somewhere? Type C-sfoo, find the definition, press enter, read it, and then press C-x C-x to go back to where you were. Simple and very useful.
Most modes support imenu. M-ximenu will let you jump to a function definition (etc.) by name. You can also bind it to a mouse click to ...