My table is like below
Main_ID | Child_ID | Activity |
1 |1 | Start
1 |2 | Stop
1 |3 | Stop
2 |1 | Start
2 |3 | Stop
What I'm looking for is like
Main_ID | Start | Stop
1 |1 |2
2 |1 |1
So, in first column I want to list all the Main_Ids and distinct Activities horizontally. After that I want to display the count of distinct Child_Ids under each activity for the Main_ID.
What I have tried is
var result = from q in db.Table
where q.Child_ID != null
group 1 by new { q.Main_ID,q.Child_ID, q.Activity } into g
select new MyList
{
Main_ID = g.Key.Main_ID,
Child_ID = g.Key.Child_ID,
Activity = g.Key.Activity,
Count = g.Count()
}
into p orderby p.Main_ID,p.Child_ID select p;
But with this I'm not getting what I have stated.
I have achieved for the Child_ID using following
var result2 = result.GroupBy(x => x.Child_ID)
.Select(grp => new MyList2
{
Child_ID = grp.Key,
StartCount = grp.Where(x => x.Activity == "Start")
.Select(x => x.Count).Cast<Int32>().FirstOrDefault(),
StopCount = grp.Where(x => x.Activity == "Stop")
.Select(x => x.Count).Cast<Int32>().FirstOrDefault()
});
Not sure how to display it against Main_ID
Considering this class:
public class Foo
{
public int Main_ID {get;set;}
public int Child_ID {get;set;}
public string Activity {get;set;}
}
With this data:
var ls=new List<Foo>
{
new Foo{Main_ID=1,Child_ID=1,Activity="Start"},
new Foo{Main_ID=1,Child_ID=2,Activity="Stop"},
new Foo{Main_ID=1,Child_ID=3,Activity="Stop"},
new Foo{Main_ID=2,Child_ID=1,Activity="Start"},
new Foo{Main_ID=2,Child_ID=3,Activity="Stop"},
};
You could do this:
var result = ls
.GroupBy (g =>g.Main_ID)
.Select (g =>new
{
Main_ID = g.Key,
Start = g.Where(s=>s.Actvity == "Start").Select(x => x.Child_ID).Distinct().Count(),
Stop = g.Where(s=>s.Actvity == "Stop").Select(x => x.Child_ID).Distinct().Count(),
}
).ToList();
Result:
Main_ID Start Stop
1 1 2
2 1 1
All,
Thanks for your help.
I could do that using following
var v = from q in myTable
where q.Child_ID != null
orderby q.ModifiedDate descending
select q;
var result2 = v
.GroupBy(g => new
{
g.Main_ID
})
.Select(grp => new MyClass
{
Main_ID = grp.Key.Main_ID,
StartCount = grp.Where(x=> x.Activity == "Start").Select(x => x.Child_ID).Distinct().Count(),
StopCount = grp.Where(x => x.Activity == "Stop").Select(x => x.Child_ID).Distinct().Count()
});
I'm getting expected resuts using this.
Now; I would like to know if this is correct approach and if the two queries can be merged.
As it had code, did not post it using comment; sorry for that :-)
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