大约有 40,000 项符合查询结果（耗时：0.0716秒） [XML]
Postgres: INSERT if does not exist already
... if one modifies the table such that more columns are unique. In that case all the scripts must be modified. It would be nice if there was a more generic way to do this...
– Willem Van Onsem
Aug 1 '14 at 13:17
...
计算统计特征（正态分布）函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...AX_VAR;
double _ave;
//double _var;
double _sam_stdev;
double _all_stdev;
double _sum;
double _sum_2;
int _count;
double _min_v;
double _max_v;
StdevInfo()
: _ave(0.0)
//, _var(MAX_VAR)
, _sam_stdev(sqrt(MAX_VAR))
, _all_stdev(0.0)
, _sum(0.0)
...
Range references instead values
...
Jairo LozanoJairo Lozano
2,11322 gold badges1111 silver badges2020 bronze badges
...
Parsing JSON Object in Java [duplicate]
...
Performance of org.json is amongst the worst of all libraries + that lib was developed as proof of concept in the early days of JSON. Choose a json lib that performs well: github.com/fabienrenaud/java-json-benchmark
– fabien
Jun 27 '1...
Java inner class and static nested class
...
132
Mind that you can also import a static nested class directly, i.e. you could do (at the top of the file): import OuterClass.StaticNestedCl...
Navigation in django
...
I like this idea a lot, especially for flexibility, but it comes with the less-DRY trade-off. I did start using this in a site though.
– anonymous coward
Sep 22 '09 at 14:47
...
ios Upload Image and Text using HTTP POST
...programmed to accept.
NSMutableDictionary* _params = [[NSMutableDictionary alloc] init];
[_params setObject:[NSString stringWithString:@"1.0"] forKey:[NSString stringWithString:@"ver"]];
[_params setObject:[NSString stringWithString:@"en"] forKey:[NSString stringWithString:@"lan"]];
[_params setObje...
Best approach to remove time part of datetime in SQL Server
...er SQL Server optimiser versions managing CAST to date correctly, but generally it will be a bad idea ...
Edit, Sep 2018, for datetime2
DECLARE @datetime2value datetime2 = '02180912 11:45' --this is deliberately within datetime2, year 0218
DECLARE @datetime2epoch datetime2 = '19000101'
select DAT...
CSS background opacity with rgba not working in IE 8
...tydot), and which matches the transparency of your background.
EDIT : to fall back for IE6+ support, you can specify bkgd chunk for the png, this is a color which will replace the true alpha transparency if it is not supported. You can fix it with gimp eg.
...
How do I check which version of NumPy I'm using?
...3.0.2)
networkx (1.11)
nltk (3.2.2)
nose (1.3.7)
notebook (5.0.0)
numba (0.32.0+0.g139e4c6.dirty)
numexpr (2.6.2)
numpy (1.11.3) <--
numpydoc (0.6.0)
odo (0.5.0)
openpyxl (2.4.1)
pandas (0.20.1)
pandocfilters (1.4.1)
....
...