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How do I perform the SQL Join equivalent in MongoDB?
...ep analysis, you do it after the fact in another database. Run a job that transforms the data into an OLAP cube for optimal performance.
– Snowburnt
Nov 4 '13 at 1:56
4
...
Most underused data visualization [closed]
... sep="")
stock.data <- read.csv(quote, as.is=TRUE)
stock.data <- transform(stock.data,
week = as.POSIXlt(Date)$yday %/% 7 + 1,
wday = as.POSIXlt(Date)$wday,
year = as.POSIXlt(Date)$year + 1900)
library(ggplot2)
ggplot(stock.data, aes(week, wday, fill = Adj.Close)) +
geom_tile(col...
Logging in Scala
...on} message!")
After the macro has been applied, the code will have been transformed into the above described idiom.
In addition ScalaLogging offers the trait Logging which conveniently provides a Logger instance initialized with the name of the class mixed into:
import com.typesafe.scalalogging...
Deleting elements from std::set while iterating
...t_end is not anymore pointing to numbers.end()
Note that while the deque transformation is correct in this particular case, the end pointer has been invalidated along the way. With the deque of a different size the error is more apparent:
int main()
{
deque<int> numbers;
numbers.push...
How to add images in select list?
...;
font-family:arial;
position:absolute;
top:50%;
right:5px;
transform:translate(0, -50%);
}
.select-sim:hover::after {
content:"";
}
.select-sim:hover {
overflow:visible;
}
.select-sim:hover .options .option label {
display:inline-block;
}
.select-sim:hover .o...
Should I always return IEnumerable instead of IList?
...ce to create the List, and once when the caller loops through, filters, or transforms your return value. When practical, I like to avoid converting the results of LINQ-to-Objects to a concrete List or Dictionary until I have to. If my caller needs a List, that's a single easy method call away - I do...
XML Schema minOccurs / maxOccurs default values
...rsion="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="html" indent="yes" version="4.0"/>
<xsl:template match="/">
<html>
<body>
<xsl:for-each select=...
App Inventor 2 FTP 客户端拓展：FTP协议连接、上传、下载、创建、修改目录...
...：FTP协议连接、上传、下载、创建、修改目录等。
需要的权限点：READ_EXTERNAL_STORAGE 和 WRITE_EXTERNAL_STORAGE。
.aix 拓展下载：
cn.fun123.FTPClient.aix
属性
无
事件
Connected(result)
连接操作完...
Determine if string is in list in JavaScript
...;> b = {};
>>> for(var i=0; i<a.length;i++){b[a[i]]="";} /* Transform the array in a dict */
>>> ("something" in b)
true
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Get time difference between two dates in seconds
...s. Then you can calculate the difference between end and start and finally transform the timestamp which is ms into s.
const start = new Date().getTime();
const end = new Date().getTime();
const diff = end - start;
const seconds = Math.floor(diff / 1000 % 60);
...