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Group by with include (inner join)


Group by with include (inner join)

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Group by with include (inner join)
Tag : chash , By : lonehunter01
Date : November 27 2020, 12:01 PM

Any of those help You should use a GroupBy statement with most of its parameters. Note the inconsistent naming of the result properties is taken 1:1 from the question. You may want to create some explicit DTO type instead of creating the result as anonymous type.
IQueryable<QuestionCategory> questionCategories = new EnumerableQuery<QuestionCategory>(Enumerable.Empty<QuestionCategory>());

var result = questionCategories.GroupBy(
    // key selector
    qc => new
    {
        categoryId = qc.CategoryId,
        categoryName = qc.Category.Name,
        IsRiquered = qc.IsRequired,
        Weigth = qc.Weigth
    },
    // element selector
    qc => qc.Question,
    // result selector
    (k, v) => new
    {
        k.categoryId,
        k.categoryName,
        k.IsRiquered,
        k.Weigth,
        questions = v.Select(q => new {questionId = q.Id, questionName = q.Name}).ToList()
    });

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LINQ group by date - include empty days WITHOUT using join


Tag : chash , By : rusl
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can Union() the data from your query with dummy items that you create in memory. For example:
var query4 = query3.ToList(); // Prevent multiple execution.

var startDate = DateTime.Today.AddDays(-99);

var emptyData = Enumerable.Range(1,100).Select (i => 
    new ReferrerChart
        {
           Date = startDate.AddDays(i),
           LeadsCount = 0,
           SalesCount = 0
        });

var result = query4 .Union(
             emptyData
                .Where(e => !query4.Select(x => x.Date).Contains(e.Date)))
             .OrderBy(x => x.Date);

Order by association count, group with join but include none? FULL OUTER JOIN?


Tag : sql , By : Umang
Date : March 29 2020, 07:55 AM
it fixes the issue I would suggest using a LEFT join from the users table. This will make sure that if you happen to have posts that aren't connected to any users, they won't be included. But you will still get back the set of users that don't have any posts.
Then you will want to just group by the users.id to make sure you get back one row per User.
User.joins("LEFT JOIN posts ON users.id = posts.user_id").group("users.id").order("COUNT(DISTINCT posts.id) DESC")
User.select("users.*, COUNT(DISTINCT posts.id) AS posts_count").joins("LEFT JOIN posts ON users.id = posts.user_id").group("users.id").order("COUNT(DISTINCT posts.id) DESC").each do |user|
  puts user.posts_count
end

COUNT(*) with LEFT JOIN and GROUP BY to include NULL in MySQL


Tag : mysql , By : nabbed
Date : March 29 2020, 07:55 AM
this one helps. I'm trying to get the results from a table including the appearance count in a foreign table. This table can have 0 or more appearances. , This works:
SELECT c.id, COUNT(f.name)
FROM color c
LEFT JOIN fruit f ON c.id = f.color_id
GROUP BY c.id

How to make a sql query on among two tables join include group by and max value


Tag : sql , By : Gianluca Riccardi
Date : March 29 2020, 07:55 AM
To fix this issue I have two tables, coaches and awardscoaches. coaches gives me the the relationship between coaches and team. awardscoaches includes the coach award informcation. Below is their structure:
max(struct(a.cnt,a.coachid)).col2   as coachid 
select      c.tmid                              as tmid
           ,max(struct(a.cnt,a.coachid)).col2   as coachid 

from                    coaches c 

            join       (select      coachid
                                   ,count(*)    as cnt

                        from        awardscoaches 

                        group by    coachid
                        ) a 

            on          a.coachid = 
                        c.coachid 

group by    c.tmid
; 

How to include NULL values in a query with Outer Join and Group By


Tag : mysql , By : user118656
Date : March 29 2020, 07:55 AM
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