大约有 46,000 项符合查询结果（耗时：0.0540秒） [XML]
How to check if a table contains an element in Lua?
...r function is as efficient as can be done. Of course, as noted by others (and as practiced in languages older than Lua), the solution to your real problem is to change representation. When you have tables and you want sets, you turn tables into sets by using the set element as the key and true as ...
Preloading images with JavaScript
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there's no onload handler for any of the images
– Benny
Jul 27 '15 at 18:22
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Full examples of using pySerial package [closed]
...show me a full python sample code that uses pyserial , i have the package and am wondering how to send the AT commands and read them back!
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Transitions with GStreamer Editing Services freezes, but works OK without transitions
...g to use gstreamer's GStreamer Editing Services to concatenate 2 videos, and to have a transition between the two.
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Math.random() explanation
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int randomWithRange(int min, int max)
{
int range = (max - min) + 1;
return (int)(Math.random() * range) + min;
}
Output of randomWithRange(2, 5) 10 times:
5
2
3
3
2
4
4
4
5
4
The bounds are inclusive, ie [2,5], an...
ASP.NET MVC3: What is the packages.config for?
...ackOverflow for most of issues/challenges I face.
– Sandeep
Jan 20 '17 at 20:22
add a comment...
How can I compare two lists in python and return matches
I want to take two lists and find the values that appear in both.
19 Answers
19
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Counting null and non-null values in a single query
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This works for Oracle and SQL Server (you might be able to get it to work on another RDBMS):
select sum(case when a is null then 1 else 0 end) count_nulls
, count(a) count_not_nulls
from us;
Or:
select count(*) - count(a), count(a) fro...
Cannot deserialize the JSON array (e.g. [1,2,3]) into type ' ' because type requires JSON object (e.
... FYI this didn't work for me because I was getting my JSON from an API and I had the freaking URL wrong for an entire day. ><
– w00ngy
Oct 5 '18 at 13:14
1
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Find location of a removable SD card
...le via USB Mass Storage mode when mounted on a host machine", at least for Android 1.x and 2.x.
But the question is about external SD. How to get a path like "/mnt/sdcard/external_sd" (it may differ from device to device)?
Android has no concept of "external SD", aside from external storage, as de...