大约有 5,530 项符合查询结果（耗时：0.0285秒） [XML]
Django-DB-Migrations: cannot ALTER TABLE because it has pending trigger events
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Almost same for me. It worked flawlessly for 100+ migrations(including ~20 data migrations) until today, while adding unique together constraint along with data migration removing duplicates before it. PostgreSQL 10.0
– LinPy fan
A...
Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
...ring data. Here's an example,
df2 = df.assign(D=list('aaabbccc')).sample(n=100, replace=True)
with pd.option_context('precision', 2):
display(df2.groupby(['A', 'B'])
.describe(include='all')
.dropna(how='all', axis=1))
C ...
How to organize large R programs?
...the interpreter much more robust than before. There is no doubt that R is 100-300x slower than C, but usually the bottleneck is concentrated around a few lines of code, which can be delegated to C/C++. I think it would be a mistake to delegate the strengths of R in data manipulation and statistical...
ggplot with 2 y axes on each side and different scales
...= "Productivity % of best",
labels = function(b) { paste0(round(b * 100, 0), "%")})) +
theme(
axis.title.y = element_text(color = "grey"),
axis.title.y.right = element_text(color = "blue"))
Here's the result (above code + some color tweaking):
The point (aside from using ...
OOP vs Functional Programming vs Procedural [closed]
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String processing is awesomely done in perl (100x better than in Java, C++ or C#) yet the string functionality of the language is absolutely NOT object oriented. C's string handling was terrible, but then C is not the only procedural language (nor the best).
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Where is the WPF Numeric UpDown control?
...ss NumericUpDown : UserControl
{
int minvalue = 0,
maxvalue = 100,
startvalue = 10;
public NumericUpDown()
{
InitializeComponent();
NUDTextBox.Text = startvalue.ToString();
}
private void NUDButtonUP_Click(object sender, RoutedEventArgs e)
{
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Comparing date part only without comparing time in JavaScript
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got a 100x speedup moving from a momentjs solution to a Date() + sethours solution. careful friends :-)
– 2c2c
Aug 11 '17 at 12:57
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Why use double indirection? or Why use pointers to pointers?
...n 28 '13 at 20:29
bharat.chandak100
10311 silver badge1212 bronze badges
answered Apr 7 '11 at 12:11
AshaAsha
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Why should I use an IDE? [closed]
...
100
Code completion. It helps a lot with exploring code.
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Join vs. sub-query
...reference to the upper query, especially when it comes to row-counts above 100,000. The thing seems to be memory usage and paging to the swap-file. A join would produce a very big amount of data, that may not fit into memory and must be paged into the swap-file. Whenever this is the case the query-t...