大约有 44,000 项符合查询结果（耗时：0.0393秒） [XML]
LEFT JOIN only first row
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If you can assume that artist IDs increment over time, then the MIN(artist_id) will be the earliest.
So try something like this (untested...)
SELECT *
FROM feeds f
LEFT JOIN artists a ON a.artist_id = (
SELECT
MIN(fa.artist_id) a_id
FROM feeds_artists fa
WHERE fa.feed_id = ...
Changing a specific column name in pandas DataFrame
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A one liner does exist:
In [27]: df=df.rename(columns = {'two':'new_name'})
In [28]: df
Out[28]:
one three new_name
0 1 a 9
1 2 b 8
2 3 c 7
3 4 d 6
4 5 e 5
Following is the docstring for the rename method.
De...
How to return result of a SELECT inside a function in PostgreSQL?
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Use RETURN QUERY:
CREATE OR REPLACE FUNCTION word_frequency(_max_tokens int)
RETURNS TABLE (txt text -- also visible as OUT parameter inside function
, cnt bigint
, ratio bigint) AS
$func$
BEGIN
RETURN QUERY
SELECT t.txt
,...
How to convert a Title to a URL slug in jQuery?
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For avoid "_" in slug, override .replace(/ +/g,'-') to .replace(/ +|_/g,'-').
– Odin Thunder
Mar 17 '17 at 13:47
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Are there any standard exit status codes in Linux?
...istd.h>
#include <signal.h>
int main() {
int status;
pid_t child = fork();
if (child <= 0)
exit(42);
waitpid(child, &status, 0);
if (WIFEXITED(status))
printf("first child exited with %u\n", WEXITSTATUS(status));
/* prints: "first child exite...
What are the “standard unambiguous date” formats for string-to-date conversion in R?
...sion will depend on your locale (see the examples in ?strptime and read ?LC_TIME).
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How to set the current working directory? [duplicate]
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Perhaps this is what you are looking for:
import os
os.chdir(default_path)
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Redirecting Output from within Batch file
...olution offered by @dbenham. So for example, this:
@echo off
> filename_prefix-%DATE:~-4%-%DATE:~4,2%-%DATE:~7,2%_%time:~0,2%%time:~3,2%%time:~6,2%.log (
echo Your Name Here
echo Beginning Date/Time: %DATE:~-4%-%DATE:~4,2%-%DATE:~7,2%_%time:~0,2%%time:~3,2%%time:~6,2%.log
REM do some stuff here
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jQuery: serialize() form and other parameters
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pass value of parameter like this
data : $('#form_id').serialize() + "&parameter1=value1&parameter2=value2"
and so on.
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Understanding Apache's access log
... 369 74500 - 567 what do they indicate?
– my account_ram
Jan 29 '14 at 21:18
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