大约有 40,000 项符合查询结果（耗时：0.0679秒） [XML]
Select count(*) from multiple tables
How can I select count(*) from two different tables (call them tab1 and tab2 ) having as result:
18 Answers
...
PHP passing $_GET in linux command prompt
Say we usually access via
13 Answers
13
...
What is the advantage of GCC's __builtin_expect in if else statements?
...
I guess it should be something like:
cmp $x, 0
jne _foo
_bar:
call bar
...
jmp after_if
_foo:
call foo
...
after_if:
You can see that the instructions are arranged in such an order that the bar case precedes the foo case (as opposed to the C code). This can utilise the CPU ...
Fastest way to list all primes below N
...4.0 |
| sundaram3 | 416.0 |
+---------------------+-------+
Of all the methods tested, allowing numpy, for n=1000000,
primesfrom2to was the fastest tested.
+---------------------+-------+
| Method | ms |
+---------------------+-------+
| primesfrom2to | 15.9 |
| p...
Correct use of Multimapping in Dapper
...ID,
CustomerName.
This makes the spliton: parameter not so useful, especially when you're not sure what order the columns are returned in. Of course you could manually specify columns...but it's 2017 and we just rarely do that anymore for basic object gets.
What we do, and it's worked great fo...
Bundling data files with PyInstaller (--onefile)
I'm trying to build a one-file EXE with PyInstaller which is to include an image and an icon. I cannot for the life of me get it to work with --onefile .
...
Automating “enter” keypresses for bash script generating ssh keys
... test while screening DH-GEX candidates
-t Type of key (ed25519, RSA, DSA etc.)
-f /mypath/bla The output file path and name
-N "" Use empty passphase
and yes "y" for no interaction.
It will generate two files
/mypath/bla
/mypath/bla.pub
where the bla file is private and bla.pub is public.
...
Difference between Visual Basic 6.0 and VBA
...iven all the other statements to the contrary on this forum, on Wikipedia, etc., it makes me wonder who is right, and why there is disagreement! Lomax also wrote (p. 3), "VBA is the same language whether you are using it to create a VB application or to automate some task in Word or Excel." Also, "V...
Why is IntelliJ 13 IDEA so slow after upgrading from version 12?
...ely to need anytime soon (eg. support for Mecurical, internationalization, etc). It took the startup time from literally MINUTES, to about 10-15 seconds). The general performance seems to be much snappier now as well. Oddly enough, the memory footprint didn't change much, in my case, staying around...
What is the difference between require and require-dev sections in composer.json?
...oding style issues)
phpunit/phpunit (to drive the development using tests)
etc.
Deployment
Now, in development and testing environments, you would typically run
$ composer install
to install both production and development dependencies.
However, in staging and production environments, you onl...