SQL to Linq - NET CORE 5 - sql

Question

I have a SQL Statement like this:
select
b.ActivityRecordId, b.ActivityName, b.ActivityDetail,
b.CustomerId, e.CustomerName,
b.JobStatusId, c.JobStatusName, b.EstimateStartDate,
b.EstimateFinishDate, b.StartedDateTime, b.FinishedDateTime,
a.ActivityRecordProgressId, a.CustomerContactId,
Concat(d.FirstName, ' ', d.MiddleName, ' ', d.LastName) as fullName,
a.Started, a.Finished, a.ActivityDescription,
g.ActivityTypeId, g.ActivityTypeName, a.ActivitySubTypeId, f.ActivitySubTypeName
from
ActivityRecordProgress a
right join
ActivityRecord b on a.ActivityRecordId = b.ActivityRecordId
left join
ActivitySubType f on a.ActivitySubTypeId = f.ActivitySubTypeId
left join
ActivityType g on f.ActivityTypeId = g.ActivityTypeId
left join
CustomerContact d on a.CustomerContactId = d.CustomerContactId
inner join
JobStatus c on b.JobStatusId = c.JobStatusId
inner join
Customer e on b.CustomerId = e.CustomerId
Then I tried to convert it to Linq:
var obj = (from a in _db.ActivityRecords
join b in _db.ActivityRecordProgresses on a.ActivityRecordId equals b.ActivityRecordId into ab
from p in ab.DefaultIfEmpty()
join c in _db.Customers on a.CustomerId equals c.CustomerId
join e in _db.CustomerContacts on c.CustomerId equals e.CustomerId
join d in _db.JobStatuses on a.JobStatusId equals d.JobStatusId
join f in _db.ActivitySubTypes on p.ActivitySubTypeId equals f.ActivitySubTypeId
join g in _db.ActivityTypes on f.ActivitySubTypeId equals g.ActivityTypeId
select new OutstandingActivityViewModel {
ActivityRecordId = p.ActivityRecordId,
ActivityName = a.ActivityName,
ActivityDetail = a.ActivityDetail,
CustomerId = a.CustomerId,
CustomerName = c.CustomerName,
JobStatusId = a.JobStatusId,
JobStatusName = d.JobStatusName,
EstimateStartDate = a.EstimateStartDate,
StartedDateTime = a.StartedDateTime,
EstimateFinishDateTime = a.EstimateFinishDate,
FinishedDateTime = a.FinishedDateTime,
FirstName = e.FirstName, MiddleName = e.MiddleName, LastName = e.LastName,
Started = p.Started, Finished = p.Finished,
ActivityTypeName = g.ActivityTypeName, ActivitySubTypeName = f.ActivitySubTypeName,
ActivityDescription = p.ActivityDescription
}).ToListAsync();
But the result is not the same. The SQL result is the right one. It only 4 records. But in Linq, it appears 6 records. I'm sure I did something wrong with the linq syntax.
Can anyone show me where the mistake in my syntax is?
Really appreciated - thank you.

Answer 1

Thanks for commenting my question. It was very useful.
Finally I found the answer after trial and error using SQL generated. Below is the answer for the Linq syntax:
var obj = (from a in _db.ActivityRecords
join b in _db.ActivityRecordProgresses on a.ActivityRecordId equals b.ActivityRecordId into leftsatu
from leftkesatu in leftsatu.DefaultIfEmpty()
join c in _db.ActivitySubTypes on leftkesatu.ActivitySubTypeId equals c.ActivitySubTypeId into leftdua
from leftkedua in leftdua.DefaultIfEmpty()
join d in _db.ActivityTypes on leftkedua.ActivitySubTypeId equals d.ActivityTypeId into lefttiga
from leftketiga in lefttiga.DefaultIfEmpty()
join e in _db.CustomerContacts on leftkesatu.CustomerContactId equals e.CustomerContactId into leftempat
from leftkeempat in leftempat.DefaultIfEmpty()
join f in _db.JobStatuses on a.JobStatusId equals f.JobStatusId
join g in _db.Customers on a.CustomerId equals g.CustomerId
select new OutstandingActivityViewModel
{
ActivityRecordId = a.ActivityRecordId,
ActivityName = a.ActivityName,
ActivityDetail = a.ActivityDetail,
CustomerId = a.CustomerId,
CustomerName = g.CustomerName,
JobStatusId = a.JobStatusId,
JobStatusName = f.JobStatusName,
EstimateStartDate = a.EstimateStartDate,
StartedDateTime = a.StartedDateTime,
EstimateFinishDateTime = a.EstimateFinishDate,
FinishedDateTime = a.FinishedDateTime,
FirstName = leftkeempat.FirstName,
MiddleName = leftkeempat.MiddleName,
LastName = leftkeempat.LastName,
Started = leftkesatu.Started,
Finished = leftkesatu.Finished,
ActivityTypeName = leftketiga.ActivityTypeName,
ActivitySubTypeName = leftkedua.ActivitySubTypeName,
ActivityDescription = leftkesatu.ActivityDescription
}
);
It will generate SQL like:
SELECT [a].[ActivityRecordId], [a].[ActivityName], [a].[ActivityDetail], [a].[CustomerId], [c0].[CustomerName], [a].[JobStatusId], [j].[JobStatusName],
[a].[EstimateStartDate], [a].[StartedDateTime], [a].[EstimateFinishDate] AS [EstimateFinishDateTime], [a].[FinishedDateTime],
[c].[FirstName], [c].[MiddleName], [c].[LastName],
[a0].[Started], [a0].[Finished], [a2].[ActivityTypeName], [a1].[ActivitySubTypeName], [a0].[ActivityDescription]
FROM [ActivityRecord] AS [a]
LEFT JOIN [ActivityRecordProgress] AS [a0] ON [a].[ActivityRecordId] = [a0].[ActivityRecordId]
LEFT JOIN [ActivitySubType] AS [a1] ON [a0].[ActivitySubTypeId] = [a1].[ActivitySubTypeId]
LEFT JOIN [ActivityType] AS [a2] ON [a1].[ActivitySubTypeId] = [a2].[ActivityTypeId]
LEFT JOIN [CustomerContact] AS [c] ON [a0].[CustomerContactId] = [c].[CustomerContactId]
INNER JOIN [JobStatus] AS [j] ON [a].[JobStatusId] = [j].[JobStatusId]
INNER JOIN [Customer] AS [c0] ON [a].[CustomerId] = [c0].[CustomerId]