I have 2 tables, first table if transactions
transaction table:
Id LoanId
1 100
The second table I have is a TransactionLeg table
transactionleg table:
ID TransactionId GLAmount
1 1 200
2 1 200
I would like to join the two on the TransactionId column, group by the loanID and sum the GLAmount
So it should produce the following:
LoanId TotalGlAmount
100 400
var investmentsWritten = from transaction in ctx.Transactions
join transactionleg in ctx.TransLegs on transaction.Id equals transactionleg.TransactionId
where
transaction.Class == Transaction.TransactionClasses.WriteOff &&
transaction.Created >= StartDate.Date && transaction.Created <= EndDate.Date
group transaction by transaction.LoanId
into g
select new { Id = g.Key, Value = _____ };
I was wondering what goes where the underline is, the value is transactionleg.GLAmount. I tried g.Sum(x => x.GLAmount) but GLAmount is not recognized, it is highlighted in red stating Cannot resolve symbol GLAmount
It is because GLAmount is in transactionleg not in transaction,
Modify your group by like this:
group new
{
transaction,
transactionleg
}
by new
{
transaction.LoanId
}
and now in Select:
select new
{
Id = g.Key,
Value = g.Sum(x=>x.transactionleg.GLAmount)
}
Related
Hi I am having two tables Country and city , country(id,Name) ,city(id,Country_id,City_name) When I am having Index action method as below , If I have 4 rows in country and there are two associated rows in cities then it only shows two rows on Country index table I mean only matched records
below is controller code I need to show all Country list even though there is any assocaited city in city table or now
var test1 = (from c in db.Cities
join cc in db.Countries
on c.Country_Id equals cc.Id into u
from cc1 in u.DefaultIfEmpty()
select new
{
Id = c.Id,
Name = c.Name,
Country_Id = c.Country.CountryName,
Code = c.Code,
IsActive = c.IsActive,
// IsActive = g.IsActive,
Date_Created = c.Date_Created,
Date_Modified = c.Date_Modified,
Latitude = c.Latitude,
Longitude = c.Longitude,
}).ToList();
return Json(new { data = test1 }, JsonRequestBehavior.AllowGet);
How could I get this SQL query right in LINQ?
SQL query:
select c.Name, sum(t.value)
from Categories c
join Items i on c.Id = i.CategoryId
join Transactions t on t.ItemId = i.Id
where datepart(YEAR, t.CreatedTime) = 2016
and datepart(MONTH, t.CreatedTime) = 2
group by c.Name
I've tried to do the same in LINQ and got this:
var query = from cat in _context.Categories
join item in _context.Items on cat.Id equals item.CategoryId
join trans in _context.Transactions on item.Id equals trans.ItemId
where trans.CreatedTime.Month == e.RowIndex && trans.CreatedTime.Year == 2016
group new { cat.Name, trans.Value } by cat.Name into g
select new
{
Value = g.Sum(entry => entry.Value)
};
But it seems to be totally wrong, besides not giving me back the category names, it returns wrong values for the sums as well.
I have three tables:
Categories with columns Id and Name
Items with columns Id, Name, CategoryId, LastValue, IsIncome,
Transactions with columns Id, ItemId, Value, CreatedTime, IsIncome
I have a parent table, parentTable which may or may not have children in childTable. I am looking to get average % complete of any given parent's children, and the MAX(due) (date) of the children where they exist. My SQL is this:
SELECT parentRecord_id, assigned_to,
(SELECT avg(complete)
FROM childTable
WHERE parent_id = parentRecord_id
and deleted IS NULL
GROUP BY parent_id),
(SELECT max(due)
FROM childTable
WHERE parent_id = parentRecord_id
and deleted IS NULL
GROUP BY parent_id
)
FROM parentTable s
WHERE s.deleted IS NULL and assigned_to IS NOT NULL
My result set gives me rows with either correct values for the average and max, or null. In this instance I have to do follow up processing so I could ignore the null values if I was doing a foreach through DataTable rows. However I am trying to do this in Linq and can't figure out how to avoid a System.InvalidOperationException where Linq is trying to cast null to a double. Here is what I've tried so far.
var query8 = from s in db.parentTable
where s.deleted == null
select new
{
ID = s.assigned_to,
Average =
((from t in db.childTable
where t.parent_id == s.strategy_id
group t by new { t.parent_id } into g
select new
{
a0 = g.Average(f0 => f0.complete )
}).FirstOrDefault().a0)
};
foreach (var itm in query8)
{
Console.WriteLine(String.Format("User id:{0}, Average: {1}", itm.ID, itm.Average));
}
Here's my question. How do I get the query to handle those returned rows where average complete or max due (date) are null?
You can either filter out the records where the values are null (by another condition) or if you want to include them do something like this:
a0 = g.Average(f0 => f0.complete.HasValue? f0.complete: 0 )
I would cast the list to nullable double before calling Average/Max like so:
var query8 =
from s in db.parentTable
where s.deleted == null
select new
{
ID = s.assigned_to,
Average =
from t in db.childTable
where t.parent_id == s.strategy_id
group t by t.parent_id into g
select g.Cast<double?>().Average(f0 => f0.complete)
};
Assuming complete is a Nullable, you should be able to do:
var query8 = from s in db.parentTable
where s.deleted == null
select new
{
ID = s.assigned_to,
Average =
((from t in db.childTable
where t.parent_id == s.strategy_id
&& s.complete.HasValue()
group t by new { t.parent_id } into g
select new
{
a0 = g.Average(f0 => f0.complete )
}).FirstOrDefault().a0)
};
Thanks to all who responded.
I was unable get around the null anonymous issue with the basic query as I had it, but adding a join to the childTable eliminated the nulls.
Another solution is to use a from x in g.DefaultIfEmpty clause.
var query8 =
from st in db.tableParent
select new { Ass = st.assigned_to ,
Avg =
(from ta in db.tableChild
group ta by ta.parent_id into g
from x in g.DefaultIfEmpty()
select g.Average((f0=>f0.complete))).FirstOrDefault()
};
Let's say I have List of object containing these two records :
EmployeeId - Category - Amount
1 - T - 150
1 - D - 300
The result I want in the final is something looking lie this :
EmployeeId - TAmount - DAmount
1 - 150 - 300
How can I achive this using LINQ, I just don't see how to do this with a simple group by on my EmployeeId field ...
var employeeId = 1;
var query =
from row in table
group row by row.EmployeeId into g
where g.Key == employeeId
select new
{
EmployeeId = row.Key,
TAmount = g.SingleOrDefault(r => r.Categpry == "T"),
DAmount = g.SingleOrDefault(r => r.Categpry == "D"),
};
I have the following view:-
CREATE VIEW tbl_adjudicator_result_view
AS
SELECT a.adjudicator_id, sar.section_adjudicator_role_id, s.section_id, sdr.section_dance_role_id, d.dance_id, c.contact_id,
ro.round_id, r.result_id, c.title, c.first_name, c.last_name, d.name, r.value, ro.type
FROM tbl_adjudicator a
INNER JOIN tbl_section_adjudicator_role sar on sar.section_adjudicator_role2adjudicator = a.adjudicator_id
INNER JOIN tbl_section s on sar.section_adjudicator_role2section = s.section_id
INNER JOIN tbl_section_dance_role sdr on sdr.section_dance_role2section = s.section_id
INNER JOIN tbl_dance d on sdr.section_dance_role2dance = d.dance_id
INNER JOIN tbl_contact c on a.adjudicator2contact = c.contact_id
INNER JOIN tbl_round ro on ro.round2section = s.section_id
LEFT OUTER JOIN tbl_result r on r.result2adjudicator = a.adjudicator_id AND r.result2dance = d.dance_id
When I run the following query directly against the db I get 0 in the count column where there is no result
select adjudicator_id, first_name, COUNT(result_id)
from tbl_adjudicator_result_view arv
where arv.round_id = 16
group by adjudicator_id, first_name
However when I use LINQ query I always get 1 in the Count Column
var query = from arv in db.AdjudicatorResultViews
where arv.round_id == id
group arv by new { arv.adjudicator_id, arv.first_name} into grp
select new AdjudicatorResultViewGroupedByDance
{
AdjudicatorId = grp.Key.adjudicator_id,
FirstName = grp.Key.first_name,
Count = grp.Select(p => p.result_id).Distinct().Count()
};
What do I need to change in the View / Linq query.
You're not doing the same thing in the LINQ query as in the SQL. COUNT(result_id) does not count distinct values of result_id - it counts non-null values.
Try this instead:
Count = grp.Select(p => p.result_id).Where(x => x != null).Count()
The point is: you're grouping your data in the LINQ query - and you'll always get at least one group.
That group's Count may be 0 - but the count of groups will be 1.