Can someone help me converting the following SQL Query into LINQ expression?
select student.StudentID,
student.FirstName + ' ' + student.MiddleInitial + ' ' + student.LastName,
student.OpenDate,
acct.Balance
from Student student
inner join
(Select StudentID, Sum(Amount) as Balance
from Account
Group by StudentID) as acct on student.StudentID = acct.StudentID
The following LINQ expression works! Thank you so much Phil!!!
var results = (from s in Students
join a in Accounts on s.StudentID equals a.StudentID
group a by new
{s.StudentID, s.FirstName, s.MiddleInitial, s.LastName, s.OpenDate}
into z
select new
{ StudentID = z.Key.StudentID,
FirstName = z.Key.FirstName,
MiddleInitial = z.Key.MiddleInitial,
LastName = z.Key.LastName,
OpenDate = z.Key.OpenDate,
Balance = z.Sum(a=> a.Amount)
}
);
Thank you!
Give this a try?
var stu =
from s in db.Students
join a in db.Account on s.StudentID equals a.StudentID
group a by new
{s.StudentID, s.FirstName, s.MiddleInitial, s.LastName, s.OpenDate}
into z
select new
{ StudentID = z.Key.StudentID,
FullName = string.Format("{0} {1} {2}",z.Key.FirstName, z.Key.MiddleInitial, z.Key.LastName),
OpenDate = z.Key.OpenDate,
Balance = z.Sum(a=>a.Amount)
};
Related
Having trouble understanding how i can convert the following SQL Query into LINQ. Specifically the MAX effective date parts.
SELECT A.NAME, X.XLATLONGNAME AS ACTION, C.DESCR, B.EFFDT
FROM ACTN_REASON_TBL C, XLATTABLE X, PERSONAL_DATA A, JOB B
WHERE A.EMPLID = B.EMPLID
AND B.ACTION = C.ACTION(+)
AND B.ACTION_REASON = C.ACTION_REASON(+)
AND (C.EFFDT = (SELECT MAX(C_ED.EFFDT) FROM ACTN_REASON_TBL C_ED
WHERE C.ACTION = C_ED.ACTION
AND C.ACTION_REASON = C_ED.ACTION_REASON
AND C_ED.EFFDT <= B.EFFDT)
OR C.EFFDT IS NULL)
AND X.FIELDNAME = 'ACTION'
AND B.ACTION = X.FIELDVALUE
AND X.EFFDT = (SELECT MAX(X_ED.EFFDT) FROM XLATTABLE X_ED
WHERE X.FIELDNAME = X_ED.FIELDNAME
AND X.LANGUAGE_CD = X_ED.LANGUAGE_CD
AND X.FIELDVALUE = X_ED.FIELDVALUE
AND X_ED.EFFDT <= SYSDATE)
AND B.ACTION_DT BETWEEN sysdate - 30 AND sysdate
AND B.ACTION NOT IN ('EOI','NBY','LIF','FSC','LOA','LTD','PLA','RFL','PAY')
ORDER BY A.NAME, B.EFFDT DESC
This is what i have so far for my LINQ query...
public ActionResult RecentTransaction()
{
RecentTransViewModel recTransModel = new RecentTransViewModel();
var minusThirty = DateTime.Today.AddDays(-90);
var today = DateTime.Now;
var exceptionList = new List<string> { "EOI", "NBY", "LIF", "FSC", "LOA", "LTD", "PLA", "RFL", "PAY" };
var transaction = (from p in recentTrans.PERSONAL_DATA
join j in recentTrans.JOB on p.EMPLID equals j.EMPLID
join a in recentTrans.ACTN_REASON_TBL on j.ACTION_REASON equals a.ACTION_REASON
join x in recentTrans.XLATTABLE_VW on j.ACTION equals x.FIELDVALUE
where x.FIELDNAME == "ACTION"
where j.ACTION_DT >= minusThirty
where j.ACTION_DT <= today
where !exceptionList.Contains(j.ACTION)
select new RecentTransViewModel
{
Name = p.NAME,
Action = x.XLATLONGNAME,
Descr = a.DESCR,
EffectiveDate = j.EFFDT
}).OrderBy(d => d.Name)
.ToList();
return View(transaction);
Any help is greatly appriciated!
LINQ allows you to add nested Queries within the same contex so that you can:
select new RecentTransViewModel
{
Name = p.NAME,
Action = x.XLATLONGNAME,
Descr = a.DESCR,
EffectiveDate = EffectiveDate = (from eft in recentTrans.XLATTABLE_VW
where eft.FIELDNAME == x.FIELDNAME AND eft.LANGUAGE_CD = X.LANGUAGE_CD AND
eft.FIELDVALUE = x.FIELDVALUE AND eft.EFFDT <= SYSDATE
select eft).Max(c=> c.EFFDT)
}).OrderBy(d => d.Name)
.ToList();
Trying to convert a SQL Query to Linq:
SELECT GrossInvoiceAmount, C.SumOfPayments
FROM invoice
OUTER APPLY(
SELECT SUM(SumOfPayments) AS SumOfPayments FROM vw_sumOfPayments
WHERE vw_sumOfPayments.PaymentDate = '01/01/2010 00:00:00'
AND vw_sumOfPayments.InvoiceId = invoice.InvoiceId
) C
WHERE LastTransmitDate = '01/01/2010 00:00:00'
I have this in my C# code. It runs and gives results, but the invoice.GrossInvoiceAmount amount is wrong. Any ideas? Thanks.
var InvoiceQuery = (from invoice in this.Context.Invoices
join payment in this.Context.vw_sumOfPayments.Where(pay => DbFunctions.TruncateTime(pay.PaymentDate) >= startdate
&& DbFunctions.TruncateTime(pay.PaymentDate) <= enddate)
on invoice.InvoiceID equals payment.InvoiceID into pays
select new InvoiceModel{
InvoiceTypeId = invoice.InvoiceTypeId,
InvoiceNumber = invoice.InvoiceNumber,
InvoiceDate = invoice.InvoiceDate,
InvoiceAmount = invoice.GrossInvoiceAmount,
PaymentAmount = pays.AsEnumerable().Sum(o => o.SumOfPayments)
});
I try to make the following query using Account, Case and Activity entities :
*var findCases =
from a in context.AccountSet
join c in context.IncidentSet
on a.AccountId equals c.CustomerId.Id
join p in context.ActivityPointerSet
on c.Id equals p.RegardingObjectId.Id
select new
{
TicketNumber = c.TicketNumber,
IncidentId = c.IncidentId,
CreatedOn = c.CreatedOn,
StateCode = c.StateCode,
AccountName = a.Name
};*
The execution of this query gives the error:
AttributeFrom and AttributeTo must be either both specified or both ommited. You can not pass only one or the other. AttributeFrom: , AttributeTo: regardingobjectid
Any suggestion will be appreciated.
Regards.
Radu Antonache
Remove CasesForAccount from the query..
*var findCases =
from a in context.AccountSet
join c in context.IncidentSet
on a.AccountId equals c.CustomerId.Id
join p in context.ActivityPointerSet
on c.Id equals p.RegardingObjectId.Id
select new
{
TicketNumber = c.TicketNumber,
IncidentId = c.IncidentId,
CreatedOn = c.CreatedOn,
StateCode = c.StateCode,
AccountName = a.Name
};*
So I have few tables and i want inner join it information two create
new object. But I have a little bit trouble.
One my table have connection one to many, and when linq request , it
give me more result than i want , he just copy information. I need
request something like this:
IPagedList<HelperListings> srch = (from l in db.gp_listing
where l.DateCreated > weekago
join lp in db.gp_listing_photo on l.Id equals lp.ListingId
join loc in db.gp_location on l.LocationId equals loc.Id
orderby l.DateCreated ascending
select new HelperListings { id = l.Id, HouseNumber = l.HouseNumber,ListingPrice = l.ListingPrice, PhotoUrl = lp.PhotoUrl.First(), AreaStateCode = loc.AreaStateCode }).ToList().ToPagedList(page ?? 1, 15);
PhotoUrl = lp.PhotoUrl.First() i need something like this but i don`t have any ideas how to do it. Need ur help guys.
UPDATE :
Responding to your comment, you have at least 2 options : 1. use group by and select only the first PhotoUrl from each group, or 2. don't join to gp_listing_photo table to avoid duplicated rows, and use subquery to get only the first PhotoUrl. Example for the latter :
IPagedList<HelperListings> srch =
(from l in db.gp_listing
where l.DateCreated > weekago
join loc in db.gp_location on l.LocationId equals loc.Id
orderby l.DateCreated ascending
select new HelperListings
{
id = l.Id,
HouseNumber = l.HouseNumber,
ListingPrice = l.ListingPrice,
PhotoUrl = (from lp in db.gp_listing_photo where l.Id = lp.ListingId select lp.PhotoUrl).FirstOrDefault(),
AreaStateCode = loc.AreaStateCode
}
).ToList().ToPagedList(page ?? 1, 15);
How about simply appending .Distinct() after your LINQ query to avoid duplicated data :
IPagedList<HelperListings> srch =
(from l in db.gp_listing
where l.DateCreated > weekago
join lp in db.gp_listing_photo on l.Id equals lp.ListingId
join loc in db.gp_location on l.LocationId equals loc.Id
orderby l.DateCreated ascending
select new HelperListings
{
id = l.Id,
HouseNumber = l.HouseNumber,
ListingPrice = l.ListingPrice,
PhotoUrl = lp.PhotoUrl,
AreaStateCode = loc.AreaStateCode
}
).Distinct().ToList().ToPagedList(page ?? 1, 15);
For Reference : LINQ Select Distinct with Anonymous Types
I am trying to reproduce a SQL query using a LINQ to Entities query. The following SQL works fine, I just don't see how to do it in LINQ. I have tried for a few hours today but I'm just missing something.
SELECT
h.ReqID,
rs.RoutingSection
FROM ReqHeader h
JOIN ReqRoutings rr ON rr.ReqRoutingID = (SELECT TOP 1 r1.ReqRoutingID
FROM ReqRoutings r1
WHERE r1.ReqID = h.ReqID
ORDER BY r1.ReqRoutingID desc)
JOIN ReqRoutingSections rs ON rs.RoutingSectionID = rr.RoutingSectionID
Edit***
I was able to get this working after looking at other examples including the one provided her by Miki. Here is the code that works for me:
First I created a query called route to hold the top record I needed to join to
var route = (from rr in context.ReqRoutings
where rr.ReqID == id
orderby rr.ID descending
select rr).Take(1);
I was then able to join to my requisitions table and the ReqRoutings lookup table
var header = (from h in context.ReqHeaders
join r in route on h.ID equals r.ReqID
join rs in context.ReqRoutingSections on r.RoutingSectionID equals rs.ID
where h.ID == id
select {ReqID = h.ID,
RoutingSection = rs.RoutingSection}
I am using Northwnd sample database
Customers,Orders,Employees table
Here I am getting top 1 order group by customer and order's employeeid
Please let me know If this is matching with your requirement or not
var ord = from o in NDC.Orders
orderby o.OrderID descending
group o by o.CustomerID into g
select new {CustomerID=g.Key,Order=g.OrderByDescending(s=>s.OrderID).First() };
var res1 = from o in ord
join emp in NDC.Employees
on o.Order.EmployeeID equals emp.EmployeeID into oemp
select new {Order=o.Order,employee=oemp };
Response.Write(res1.ToList().Count);
foreach (var order in res1)
{
Response.Write(order.Order.CustomerID + "," +
order.Order.OrderID + ","+
order.Order.EmployeeID+"<br/>");
}
// Above code is working .I have tried to convert your query to linq and replace your datacontext name with 'NDC'
var ord = from rr in NDC.ReqRoutings
orderby rr.ReqRoutingID descending
group rr by rr.ReqID into g
select new
{
ReqID = g.Key,
ReqRoutings = g.OrderByDescending(s => s.ReqRoutingID).First()
};
var res1 = from o in ord
join emp in NDC.ReqRoutingSections on o.ReqRoutings.RoutingSectionID
equals emp.RoutingSectionID into oemp
select new { ReqRoutings = o.ReqRoutings, employee = oemp };
Response.Write(res1.ToList().Count);
foreach (var order in res1)
{
Response.Write(order.ReqRoutings.ReqID + "," +
order.ReqRoutings.ReqRoutingID + "," +
order.ReqRoutings.RoutingSectionID + "<br/>");
}
Please let know if it is help you or not