大约有 41,000 项符合查询结果（耗时：0.0449秒） [XML]
Rails find record with zero has_many records associated [duplicate]
..._joins(:photos).where(photos: {id: nil})
which will result in SQL like:
SELECT cities.*
FROM cities LEFT OUTER JOIN photos ON photos.city_id = city.id
WHERE photos.id IS NULL
Using includes:
City.includes(:photos).where(photos: {id: nil})
will have the same result, but will result in much ug...
Pandas every nth row
...] # Excludes every 3rd row starting from 0
df2 = df[df.index % 3 == 0] # Selects every 3rd raw starting from 0
This arithmetic based sampling has the ability to enable even more complex row-selections.
This assumes, of course, that you have an index column of ordered, consecutive, integers star...
How do I format a number with commas in T-SQL?
...
In SQL Server 2012 and higher, this will format a number with commas:
select format([Number], 'N0')
You can also change 0 to the number of decimal places you want.
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IntelliJ - Convert a Java project/module into a Maven project/module
...
Right-click on the module, select "Add framework support...", and check the "Maven" technology.
(This also creates a pom.xml for you to modify.)
If you mean adding source repository elements, I think you need to do that manually–not sure.
Pre-Inte...
Multiple Updates in MySQL
... another useful option is not yet mentioned:
UPDATE my_table m
JOIN (
SELECT 1 as id, 10 as _col1, 20 as _col2
UNION ALL
SELECT 2, 5, 10
UNION ALL
SELECT 3, 15, 30
) vals ON m.id = vals.id
SET col1 = _col1, col2 = _col2;
...
Visual Studio Copy Project
... to the project you want to copy in solution explorer and right-click.
Now select 'Open Folder in File Explorer' (Assuming you have the solution mapped to a local path on your disk).
Select the Projects you want to replicate as whole folders(along with all dependencies,bin .vspscc file, .csproj file...
How to increase font size in NeatBeans IDE?
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In OS X, Netbeans 8.0
Use Command + , to open the options
Select Fonts & Colors tab
Click the button in the Font section (button is next to the Font textbox)
Change the Font, style and size as needed
...
Wildcards in jQuery selectors
...htly blurred with respect to the two and so your able to use the attribute selectors for (at least some) properties.
– johntrepreneur
May 10 '13 at 21:14
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Is there a shortcut to make a block comment in Xcode?
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Created Automator service using AppleScript
Make sure "Output replaces selected text" is checked
Enter the following code:
on run {input, parameters}
return "/*\n" & (input as string) & "*/"
end run
Now you can access that service through Xcode - Services menu, or by right clicking...
ReSharper - force curly braces around single line
...f-else" statement" to "Use braces for multiline"
After saving the changes, select a scope to reformat (could be a code selection, file, folder, project, solution - anything you want).
Choose ReSharper > Tools > Cleanup Code.
Profit.
Remember that Code Cleanup does numerous things and they're...