大约有 47,000 项符合查询结果（耗时：0.0802秒） [XML]
MySQL: @variable vs. variable. What's the difference?
...nitialize this variable with a SET statement or inside a query:
SET @var = 1
SELECT @var2 := 2
When you develop a stored procedure in MySQL, you can pass the input parameters and declare the local variables:
DELIMITER //
CREATE PROCEDURE prc_test (var INT)
BEGIN
DECLARE var2 INT;
SET var...
Argparse optional positional arguments?
...
|
edited Jan 2 '17 at 8:30
anatoly techtonik
16.3k88 gold badges102102 silver badges124124 bronze badges
...
Remove 'a' from legend when using aesthetics and geom_text
...
146
Set show.legend = FALSE in geom_text:
ggplot(data = iris,
aes(x = Sepal.Length, y = Se...
How to limit UITableView row reordering to a section
...
181
This implementation will prevent re-ordering outside of the original section like Phil's answe...
How to make PyCharm always show line numbers
...
|
edited Apr 15 '16 at 18:39
mikeDOTexe
31833 silver badges1414 bronze badges
answered Apr ...
Why is a round-trip conversion via a string not safe for a double?
...
178
I found the bug.
.NET does the following in clr\src\vm\comnumber.cpp:
DoubleToNumber(value, ...
Sublime Text 2: Trim trailing white space on demand
...
71
Beware: using this plugin makes Sublime Text significantly slower
I use TrailingSpaces plugin f...
Fastest way to iterate over all the chars in a String
...e now Java will store strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'charAt' and field access. It appears that the jvm is sufficiently optimized to inline and streamline any 'string.charAt(n)' calls.
THIRD UPDAT...
Passing multiple error classes to ruby's rescue clause in a DRY fashion
...
201
You can use an array with the splat operator *.
EXCEPTIONS = [FooException, BarException]
begi...
Where is the “Fold” LINQ Extension Method?
...
127
You will want to use the Aggregate extension method:
double product = doubles.Aggregate(1.0, ...