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How to count and sort data in junction table


How to count and sort data in junction table

By : Saicharan
Date : November 21 2020, 03:00 PM
like below fixes the issue I have tables with many to many relationship: , If you need just id_product:
code :
select id_product,
count(id_param) as matches 
from Parameters_Product
where
id_param in (1,2,6,9)
group by id_product
having count(id_param) >1
order by matches desc;
select p.name,count(pp.id_param) as matches 
from 
Product p
join Parameters_Product pp
on p.id=pp.id_product
where
pp.id_param in (1,2,6,9)
group by p.name
having count(pp.id_param) >1
order by matches desc;
select p.name,pp.matches from Product p
join
(select id_product,
count(id_param) as matches 
from Parameters_Product
where
id_param in (1,2,6,9)
group by id_product
having count(id_param) >1) pp
on p.id = pp.id_product
order by pp.matches desc;


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Using LINQ to get Max Count in Junction Table

Using LINQ to get Max Count in Junction Table


By : Alexander Holub
Date : March 29 2020, 07:55 AM
I hope this helps you . I have gone through a lot of questions on Stackoverflow and I'm afraid that I still can't find an answer for this. I am using Entity Framework. Using LINQ I am trying to find the most popular class session in the last seven days. I have Four tables involved in the query, Schedules, Sessions, Locations and junction table ClientSesions
code :
 var query = from s in Schedules
                        join ss in Schedules on s.SessionID equals ss.SessionID
                        join c in ClientSessions on ss.SessionID equals c.SessionID
                        join l in Locations on s.LocationID equals l.LocationID
                        where s.CompanyID =  109  && s.LocationID = 4 && (s.ClassDate >= DateTime.Now.AddDays(-7))
                         group c by new
                        {
                            c.ClassDate,
                            l.LocationName 
                        } into gcs
                        select new  
                        {
                            ClassDate = gcs.Key.ClassDate,
                            LocationName = gcs.Key.LocationName,
                            SessionIDCount = gcs.c.Count()
                        };
How to get the Count of an Entity Framework Junction Table

How to get the Count of an Entity Framework Junction Table


By : kaspervs
Date : March 29 2020, 07:55 AM
this will help
I need a way to query the total number of records in that xref.UserRole table
code :
db.Users.Sum(u => u.Roles.Count());
SELECT COUNT(*) FROM xref.UserRole
How i can update junction table automatically and access data from junction table?

How i can update junction table automatically and access data from junction table?


By : user24410
Date : March 29 2020, 07:55 AM
Does that help You can use query like -
INSERT INTO rel_users_demo (demo_ID,users_ID) SELECT demo.ID, users.ID join on demo.EMail = users.email
Yii2. How to sort results by attributes in junction table?

Yii2. How to sort results by attributes in junction table?


By : Dani
Date : March 29 2020, 07:55 AM
Any of those help I have 3 tables: sp_pages, sp_messages and sp_messages_pages (for many-to-many relations). The sp_messages_pages table have 5 columns: , First way -- joining relation table to already selected messages
code :
$this->hasMany(Messages::className(), ['id' => 'id_messages']) 
    ->viaTable('sp_messages_pages', ['id_pages' => 'id'], 
        function ($query) { 
            $query->andWhere(['enabled' => 'Yes']); 
        }
    )
    ->leftJoin('sp_messages_pages MP', 'MP.id_messages = sp_messages.id')
    ->orderBy(['MP.sorting' => SORT_ASC]);
$sql = "
    SELECT m.* FROM sp_messages AS m
    JOIN WITH sp_messages_pages AS mp ON mp.id_messages = m.id
    JOIN WITH sp_pages AS p ON p.id = mp.id_pages
    WHERE mp.enabled = 'Yes' AND p.id = :page_id
    ORDER BY mp.sorting ASC
";

return Messages::findBySql($sql, [':page_id' => $this->id]);
Room many-to-many with properties in the junction table, how to display list of objects with columns from junction table

Room many-to-many with properties in the junction table, how to display list of objects with columns from junction table


By : ellie
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have a Room database with a many-to-many join, but in that table there are additional properties. Let's say there are Songs, People, and the join has a rating (1-5). , I got it. I created a POGO and loaded it up.
code :
public class SongAndRating {

    private int songId;
    private String name;
    private int personId;
    private int rating;

... (constructor/getters/setters)
}
@Dao
public interface PersonSongDao {

    @Query("SELECT ps.songId, ps.personId, s.name, ps.rating FROM Song s INNER JOIN PersonSong ps ON s.id=ps.songId WHERE ps.personId=:person ORDER BY s.name")
    LiveData<List<SongAndRating>> getAllSongsForPerson(long personId);

}
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