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How can I select rows with most recent timestamp for each key value?
I have a table of sensor data. Each 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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How to list all users in a Linux group?
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If I absolutely had to do this myself, I'd probably do it in reverse: use id to get the groups of every user on the system (which will pull all sources visible to NSS), and use Perl or something similar to maintain a hash table for each group discovered noting the membership of that user.
Edit: Of...
Why does ReSharper want to use 'var' for everything?
... this very easily. There are reasons to use var, f.e. with a Dictionary<string, List<SomeType<int>>>. But if the full-type-name is not too long and you don't use new on the right side (or an explicit cast) resharper should not suggest it.
– Tim Schmelter
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How can I return an empty IEnumerable?
...n the following code and the suggestions given in this question , I've decided to modify this original method and ask if there are any values in the IEnumarable return it, if not return an IEnumerable with no values.
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Using switch statement with a range of value in each case?
... ternary operators.
public class Solution {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = Integer.parseInt(sc.nextLine());
switch ((1 <= num && num <= 5 ) ? 0 :
(6 <= num && num <= 1...
Test for existence of nested JavaScript object key
...y property keys change (they will), all devs on the project would have to 'string search' the entire codebase. This isn't really a solution to the problem, as it introduces a much bigger problem
– Drenai
Jan 14 '18 at 11:20
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How to dynamically create generic C# object using reflection? [duplicate]
...ind References" and Refactor -> Rename.
public Task <T> factory (String name)
{
Task <T> result;
if (name.CompareTo ("A") == 0)
{
result = new TaskA ();
}
else if (name.CompareTo ("B") == 0)
{
result = new TaskB ();
}
return result;
}
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How to create a hash or dictionary object in JavaScript [duplicate]
...y Objects. That syntax implicitly casts the subscript value to a primitive string or symbol. Maps support any values as keys, so you must use the methods .get(key), .set(key, value) and .has(key).
var m = new Map();
var key1 = 'key1';
var key2 = {};
var key3 = {};
m.set(key1, 'value1');
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Getting a random value from a JavaScript array
... When using typescript: Be aware that the return type would be "string | undefined" instead of "string" given a string array.
– Stephan Schielke
May 6 at 18:18
add ...
How to parse XML in Bash?
...g:
<tag>value</tag>
The first call to read_dom get an empty string (since the '<' is the first character). That gets split by IFS into just '', since there isn't a '>' character. Read then assigns an empty string to both variables. The second call gets the string 'tag>value'....