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How to check the version of GitLab?
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336
I have updated my server to GitLab 6.6.4 and finally found the way to get version of GitLab re...
What exactly is Arel in Rails 3.0?
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What exactly is Arel in Rails 3.0?
It's an object model for an algebra of relational query operators.
I understand that it is a replacement for ActiveRecord
No, it isn't. It's a replacement for hand-crafting SQL queries in strings. It is a common query...
Making an array of integers in iOS
...] = i;
// to get one of them
NSLog (@"The 4th integer is: %d", myIntegers[3]);
Or, you can use an NSArray or NSMutableArray, but here you will need to wrap up each integer inside an NSNumber instance (because NSArray objects are designed to hold class instances).
NSMutableArray *myIntegers = [NS...
Changing git commit message after push (given that no one pulled from remote)
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edited May 23 '17 at 10:31
Community♦
111 silver badge
answered Jan 24 '12 at 2:02
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How do you manually execute SQL commands in Ruby On Rails using NuoDB
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edited Jan 23 '19 at 10:24
Jan Klimo
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Update MongoDB field using value of another field
..."name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
MongoDB 3.4+
In 3.4+ you can use $addFields and the $out aggregation pipeline operators.
db.collection.aggregate(
[
{ "$addFields": {
"name": { "$concat": [ "$firstName", " ", "$lastName" ] }
}},
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Fastest way to replace NAs in a large data.table
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system.time(a_gdata = f_gdata(dt1))
user system elapsed
18.805 12.301 134.985
system.time(a_andrie = f_andrie(dt1))
Error: cannot allocate vector of size 305.2 Mb
Timing stopped at: 14.541 7.764 68.285
system.time(f_dowle(dt1))
user system elapsed
7.452 4.144 19.590 # EDIT h...
PyCharm shows unresolved references error for valid code
...Dmitry Trofimov
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3
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Unicode与UTF-8互转(C语言实现) - C/C++ - 清泛网 - 专注C/C++及内核技术
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ASCII码一共规定了128个字符的编码, 比如空格"SPACE"是32(二进制00100000), 大写的
字母A是65(二进制01000001). 这128个符号(包括32个不能打印出来的控制符号), 只占用
了一个字节的后面7位, 最前面的1位统一规定为0.
1.2 非ASCII编码
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jQuery Tips and Tricks
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share
edited Mar 23 '11 at 18:51
community wiki
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