大约有 13,000 项符合查询结果（耗时：0.0138秒） [XML]
Joining three tables using MySQL
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Simply use:
select s.name "Student", c.name "Course"
from student s, bridge b, course c
where b.sid = s.sid and b.cid = c.cid
share
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How to create a video from images with FFmpeg?
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-pattern_type glob
This great option makes it easier to select the images in many cases.
Slideshow video with one image per second
ffmpeg -framerate 1 -pattern_type glob -i '*.png' \
-c:v libx264 -r 30 -pix_fmt yuv420p out.mp4
Add some music to it, cutoff when the presumably...
When is it better to use String.Format vs string concatenation?
...rmance hit, but to be honest it'll be minimal if present at all - and this concatenation version doesn't need to parse the format string.
Format strings are great for purposes of localisation etc, but in a case like this concatenation is simpler and works just as well.
With C# 6
String interpolat...
Create JSON object dynamically via JavaScript (Without concate strings)
...estions%2f16507222%2fcreate-json-object-dynamically-via-javascript-without-concate-strings%23new-answer', 'question_page');
}
);
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PadLeft function in T-SQL
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I believe this may be what your looking for:
SELECT padded_id = REPLACE(STR(id, 4), SPACE(1), '0')
FROM tableA
or
SELECT REPLACE(STR(id, 4), SPACE(1), '0') AS [padded_id]
FROM tableA
I haven't tested the syntax on the 2nd example. I'm not sure if that works 100%...
Are there pronounceable names for common Haskell operators? [closed]
...lt;|> or / alternative expr <|> term: "expr or term"
++ concat / plus / append
[] empty list
: cons
:: of type / as f x :: Int: f x of type Int
\ lambda
@ as go ll@(l:ls): go ll as l cons ls
~ lazy go ~(a,b): go la...
Merge 2 arrays of objects
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same result as the much simpler: arr1 = arr1.concat(arr2)
– keithpjolley
Nov 1 '16 at 14:55
9
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How do I combine two data frames?
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You can also use pd.concat, which is particularly helpful when you are joining more than two dataframes:
bigdata = pd.concat([data1, data2], ignore_index=True, sort=False)
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How can I determine if a date is between two dates in Java? [duplicate]
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Is this better than the "selected solved answer"?
– Christian Moen
Jan 21 '17 at 23:01
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How to round an average to 2 decimal places in PostgreSQL?
... round that takes a precision is only available for numeric.
regress=> SELECT round( float8 '3.1415927', 2 );
ERROR: function round(double precision, integer) does not exist
regress=> \df *round*
List of functions
Schema | Name | Result data type | Argument...