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How to select a single field for all documents in a MongoDB collection?
...uery. In the result set, only the item and qty fields and, by default, the _id field return in the matching documents.
db.inventory.find( { type: 'food' }, { item: 1, qty: 1 } )
In this example from the folks at Mongo, the returned documents will contain only the fields of item, qty, and _id.
Thus...
mysql -> insert into tbl (select from another table) and some default values [duplicate]
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247
You simply have to do:
INSERT INTO def (catid, title, page, publish)
SELECT catid, title, 'pa...
Win32汇编--使用MASM - C/C++ - 清泛网 - 专注C/C++及内核技术
... mov dx,offset szHello
int 21h
mov ah,4ch
int 21h
code ends
end start
在这个源程序中，stack段为堆栈找了个家，hello world字符串则跑到数据段中去了，代码则放在代码段中，程序的开始语句必须由最后一...
How to find the JVM version from a program?
...version "12" "1.8.0_201" "1.5.0_22" Java Runtime Environment version, which may be interpreted as a Runtime.Version
java.version.date "2019-03-19" ...
SQLAlchemy: cascade delete
... StevenSteven
23.8k55 gold badges5353 silver badges4747 bronze badges
6
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Download the Android SDK components for offline install
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54
To install android component do following steps
Run android sdk manager on offline machine
Cli...
Is there a way to detach matplotlib plots so that the computation can continue?
...plotlib 1.1.
– rumpel
Mar 7 '13 at 14:04
4
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How to remove last n characters from every element in the R vector
..._bar","bar_foo","apple","beer")
a = data.frame("data"=char_array,"data2"=1:4)
a$data = substr(a$data,1,nchar(a$data)-3)
a should now contain:
data data2
1 foo_ 1
2 bar_ 2
3 ap 3
4 b 4
share
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How to concatenate two MP4 files using FFmpeg?
I'm trying to concatenate two mp4 files using ffmpeg. I need this to be an automatic process hence why I chose ffmpeg. I'm converting the two files into .ts files and then concatenating them and then trying to encode that concated .ts file. The files are h264 and aac encoded and I'm hoping to kee...
How to change field name in Django REST Framework
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edited Apr 19 '19 at 4:27
PatDuJour
83688 silver badges2020 bronze badges
answered Apr 9 '14 at 9:4...