大约有 40,000 项符合查询结果（耗时：0.0688秒） [XML]
SQL: How to get the count of each distinct value in a column?
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SELECT
category,
COUNT(*) AS `num`
FROM
posts
GROUP BY
category
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Launching Google Maps Directions via an intent on Android
...o set the default transit mode in the intent. By default the car option is selected. Can I set Walking as the default mode?
– Bear
Jan 7 '13 at 17:32
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How to debug PDO database queries?
...gt;setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING );
$db->query('SELECT *******');
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VS2010 and IE10 Attaching the Script debugger to process iexplore.exe failed
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Why this was not selected as answer? Worked for me (IE10, VS2010, WIN 7 64bit).
– TheVillageIdiot
Mar 28 '13 at 3:18
1
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How does “cat
...1. Assign multi-line string to a shell variable
$ sql=$(cat <<EOF
SELECT foo, bar FROM db
WHERE foo='baz'
EOF
)
The $sql variable now holds the new-line characters too. You can verify with echo -e "$sql".
2. Pass multi-line string to a file in Bash
$ cat <<EOF > print.sh
#!/bin...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...be console output can tell you if your input is MJPEG:
$ ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=nw=1 input.avi
codec_name=mjpeg
Then you can extract the frames using the mjpeg2jpeg bitstream filter:
$ ffmpeg -i input.avi -codec:v copy -bsf:v mjpeg2jpeg outp...
Regex - Should hyphens be escaped? [duplicate]
Hyphen is a special character in regex, for instance, to select a range, I could do something like:
3 Answers
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How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
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For merge, it runs a SELECT query. Otherwise, it checks the id and the version.
– Vlad Mihalcea
Sep 4 at 3:46
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Do checkbox inputs only post data if they're checked?
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Workaround: use <select>with two options on and off :-)
– andy
May 23 '18 at 9:26
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Windows threading: _beginthread vs _beginthreadex vs CreateThread C++
...it can be done. But yeah, it ain't bloody likely for almost all but a very select few.
– WhozCraig
Sep 3 '12 at 7:24
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