大约有 31,840 项符合查询结果（耗时：0.0397秒） [XML]
How to select bottom most rows?
...urn rows in A->Z order, but select the top 200 in Z->A order this is one way to do it. The other answers, suggesting just changing the ORDER BY will not return the same results described in the question, as they will be out of order (unless order doesn't matter, which the OP did not say).
...
Clang vs GCC - which produces faster binaries? [closed]
...GCC, but I discovered Clang recently and I'm pondering switching. There is one deciding factor though - quality (speed, memory footprint, reliability) of binaries it produces - if gcc -O3 can produce a binary that runs 1% faster, or Clang binaries take up more memory or just fail due to compiler bu...
Compelling examples of custom C++ allocators?
...note that have been some historic issues with TBB freeing stuff created on one thread in another thread (apparently a classic problem with thread private heaps and producer-consumer patterns of allocation & deallocation. TBB claims it's allocator avoids these issues but I have seen otherwise. ...
How do I revert a Git repository to a previous commit?
...ts
If, on the other hand, you want to really get rid of everything you've done since then, there are two possibilities. One, if you haven't published any of these commits, simply reset:
# This will destroy any local modifications.
# Don't do it if you have uncommitted work you want to keep.
git rese...
What are deferred objects?
... of any synchronous or asynchronous function.
Deferred Methods:
deferred.done()
Add handlers to be called when the Deferred object is resolved.
deferred.fail()
Add handlers to be called when the Deferred object is rejected.
deferred.isRejected()
Determine whether a Deferred object has been r...
What are bitwise shift (bit-shift) operators and how do they work?
... not undefined, though; the standard requires implementations to define it one way or another. However, left shifts of negative signed numbers is undefined behaviour (signed integer overflow). So unless you need arithmetic right shift, it's usually a good idea to do your bit-shifting with unsigned...
Which version of PostgreSQL am I running?
... @Timo, this is a query to be run through PostgreSQL. This could be done through pgAdmin, or any other mechanism for running a query. Were you trying to run it from an Ubuntu shell? (this won't work)
– Highly Irregular
Jul 10 '14 at 2:31
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How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess
... in array
for i in $n_procs; do
./procs[${i}] &
pids[${i}]=$!
done
# wait for all pids
for pid in ${pids[*]}; do
wait $pid
done
share
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MySQL - UPDATE multiple rows with different values in one query
...ssumes that the user_rol, cod_office combination is a primary key. If only one of these is the primary key, then add the other field to the UPDATE list.
If neither of them is a primary key (that seems unlikely) then this approach will always create new records - probably not what is wanted.
However...
Changing the default folder in Emacs
...r than editing your .emacs file, since it will allow you to have more than one shortcuts with more than one starting directory, and it lets you have the normal command line behavior of Emacs if you need it.
CWD = current working directory = PWD = present working directory. It makes a lot more sense...