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SQL grouping averages


SQL grouping averages

By : MLDUB- CLUB12
Date : October 16 2020, 03:08 PM
it fixes the issue Looks like the query is doing a CROSS JOIN operation, a cartesian product, matching every movie to each moviestar. Seems like we would only want to match a moviestar to particular movies, probably using (including) the starsin table to get the matches.
I recommend you ditch the old-school comma operator the join operation. Use the newer JOIN keyword instead. And put the join predicates in the appropriate ON clause instead of the WHERE clause.
code :
 SELECT ms.sname
 --   , ms.sno
      , AVG(m.profit)  AS  avg_profit
 --   , SUM(m.profit)  AS  tot_profit 
   FROM MovieStar ms
   JOIN StarsIn si 
      ON si.sno = ms.sno
    JOIN Movie m
      ON m.mno = si.mno
   GROUP BY ms.sno, ms.sname
  HAVING SUM(m.profit) > 200
   ORDER BY AVG(m.profit) DESC


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PHP - Grouping matching variables and calculate averages

PHP - Grouping matching variables and calculate averages


By : Argetim Ahmeti
Date : March 29 2020, 07:55 AM
around this issue Instead of doing the averaging calculations on the server, you could let MySQL do it for you. You could use a query like this to retrieve the data grouped and averaged directly from MySQL
code :
SELECT avg(foodScore), visitDateTime FROM feedback WHERE visitDateTime BETWEEN FROM_UNIXTIME($fromDate) AND FROM_UNIXTIME($toDate) group by visitDateTime
Grouping averages of students scores

Grouping averages of students scores


By : Prasanna
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I have student list like below
code :
var groups = students.GroupBy(s => s.Scores.Average());
foreach(var g in groups){
    Console.WriteLine("Average: "+ g.Key);
    foreach(var s in g){
        Console.WriteLine(s.ID +":"+ s.First +" "+ s.Last);
    }
}
Linq Grouping and averages

Linq Grouping and averages


By : Brent Tmo
Date : March 29 2020, 07:55 AM
I hope this helps . How would you calculate the average of boolean values ? I think the Count aggregate should be what you are looking for:
code :
Count = av.Count(x => x.HasExtraBaggageSpace)
Count = av.Average(x => x.HasExtraBaggageSpace ? 1 : 0)
Count = av.Average(x => av.Count(y=>y.HasExtraBaggageSpace))
public AverageReturnArgs GetAverage(List<Log> logs, DateTime TimeReq)
{
    int hour = TimeReq.Hour;
    int min = TimeReq.Minute;
    var average = logs
    .Where(log => log.TimeStamp.Hour == hour && log.TimeStamp.Minute == min)
    .GroupBy(grp => grp.TimeStamp)
    .Select(av => new AverageReturnArgs()
    {
        Hour = hour,
        Minute = min,
        Count = av.Average(x => av.Count(y=>y.HasExtraBaggageSpace))
    });
}
SQL grouping averages per year

SQL grouping averages per year


By : Pietro Argentieri
Date : March 29 2020, 07:55 AM
will help you I have a SQL query that looks like this
code :
SELECT 
`table`.Property AS 'Property',
`table`.Year AS 'Year',
AVG(`table`.`Value`) AS 'Average Sold Price'
FROM
`table`
WHERE `table`.`Area` LIKE '%NW1%'
GROUP BY `table`.Property,`table`.Year
ORDER BY `table`.Property ASC
Complex grouping and averages in Django

Complex grouping and averages in Django


By : Neethu
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Ouch, hard ones.
Since these are not informations that you will need often to be refreshed, I would suggest you add 3 fields to the Author model, then attach a post_save signal on the Book model: every time a book is created, you just calculate those values and store them in the Author model.
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