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How can I select rows with most recent timestamp for each key value?
...ch row has a sensor id, a timestamp, and other fields. I want to select a single row with latest timestamp for each sensor, including some of the other fields.
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instantiate a class from a variable in PHP?
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Put the classname into a variable first:
$classname=$var.'Class';
$bar=new $classname("xyz");
This is often the sort of thing you'll see wrapped up in a Factory pattern.
See Namespaces and dynamic language features for further details.
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Omit rows containing specific column of NA
I want to know how to omit NA values in a data frame, but only in some columns I am interested in.
8 Answers
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Java code for getting current time [duplicate]
I am searching code in java for fetching or synchronizing my local PC system time into my application.
14 Answers
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How set the android:gravity to TextView from Java side in Android
I can use android:gravity="bottom|center_horizontal" in xml on a textview to get my desired results, but I need to do this programmatically. My textview is inside a tablerow if that matters in a relativelayout .
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Android: Clear Activity Stack
I'm having several activities in my application. and flow is very complicated. When I click the Logout application navigates to login Screen and from there user can exit by cancel button (calling system.exit(0) )
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Python dict how to create key or append an element to key?
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D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D
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T-SQL datetime rounded to nearest minute and nearest hours with using functions
In SQL server 2008, I would like to get datetime column rounded to nearest hour and nearest minute preferably with existing functions in 2008.
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Why do we need fibers
For Fibers we have got classic example: generating of Fibonacci numbers
2 Answers
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MSysGit vs. Git for Windows
I am having trouble determining the difference between MSysGit and Git for Windows . How are they different? Why would I choose one over the other?
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