Query:
SELECT COUNT(*) as Avalied
FROM LeaveMaster as lm
JOIN LeaveSubsidary as ls
ON lm.TransMasterId = ls.TransMasterId
WHERE lm.SystemCode = 'abc123' AND lm.EmployeeCode = '0014' AND lm.Status ='Approved'
Group by ls.Leave_Type
How would you convert the above sql query to linq? Thanks :)
Edit :
from p in db.PY_LeaveTransactionMasterTAB.AsEnumerable()
join e in db.PY_LeaveTransactionSubsidaryTAB.AsEnumerable() on p.LV_TransMasterId equals e.LV_TransMasterId into grp
where p.SystemCode == SysCode && p.EmployeeCode == EmpCode && p.Status == "Approved"
group grp by e.Leave_Type // This line is invalid Why?
The above is what I have tried so far, why can't I do e.Leave_Type or what is the right way to do group grp by e.Leave_Type?
You could try this:
(from p in db.PY_LeaveTransactionMasterTAB
join e in db.PY_LeaveTransactionSubsidaryTAB on p.LV_TransMasterId equals e.LV_TransMasterId
where p.SystemCode == SysCode && p.EmployeeCode == EmpCode && p.Status == "Approved"
group new {p,e} by new {e.Leave_Type } into gr
select new
{
Leave_Type = gr.Key.Leave_Type ,
Count = gr.Count()
}).ToList();
Related
I'm trying to transfer a query to LINQ
It's a bit complicated and I don't know if I'm doing the right thing
There is also a problem with SELECT to save it properly
SQL QUERY:
SELECT ISNULL(SUM(1),0) TotalSubmitted,
ISNULL(SUM(CASE WHEN Pic.PhotoFileName IS NULL THEN 0 ELSE 1 END),0) TotalAssigned
FROM tblFromPhone Ph
INNER JOIN tblOfficer O ON Ph.OfficerCode = O.Code
OUTER APPLY(SELECT PhotoFileName FROM tblPhotos P
WHERE P.validityTo IS NULL
AND P.PhotoFileName = Ph.DocName
AND P.OfficerID = O.OfficerID)Pic
WHERE CAST(Ph.LandedDate AS DATE) BETWEEN #FromDate AND #ToDate
AND O.ValidityTo IS NULL
AND DocType = N'E'
AND OfficerCode = #OfficerCode
My LINQ:
var res = (from FP in context.TblFromPhone
join O in context.TblOfficer on FP.OfficerCode equals O.Code
join P in context.TblPhotos on FP.DocName equals P.PhotoFileName into P
from Ph in P.Where(x => x.OfficerId == O.OfficerId).DefaultIfEmpty()
where Ph.ValidityTo == null
where FP.LandedDate >= DateTime.Parse(fromDate)
&& FP.LandedDate <= DateTime.Parse(toDate)
&& O.ValidityTo == null
&& FP.DocType == "E"
&& FP.OfficerCode == officerCode
select new EnrolmentModel()
{
TotalSubmitted = // How to make?
TotalAssigned = // How to make?
})
.FirstOrDefault();
I have the following query that I would like to translate to linq.
SELECT
SUM(Credits.CreditAmount)
,Transactions.Id
,Person.FullName
,Person.Id
FROM
Person
JOIN
Transactions
ON Person.AccountId = Transactions.AccountId
JOIN Credits
ON Transactions.Id = Credits.TransactionId
WHERE
Person.Type = 'AccountHolder'
AND Person.Status = 'Active'
AND Transactions.CancelledDate IS NULL
AND Credits.CancelledDate IS NULL
GROUP BY Transactions.AccountId, Person.FullName, Person.Id
HAVING SUM(Credits.CreditAmount) > 20
This is what I came up with. It's an absolute pig... The SQL it generates must be awful.
var query = from p in Person
join t in Transactions
on p.AccountId equalas t.AccountId
join c in Credits
on t.TransactionId = c.TransactionId
where p.Status == "Active" &&
p.Type = "AccountHolder" &&
t.CancelledDate == null &&
c.CancelledDate == null
group new { c.CreditAmount, t.AccountId, p.FullName, p.Id } by new { t.AccountId, p.FullName, p.SSN } into grp
let sumC = grp.Select(x => x.CreditAmount).Sum()
select new
{
TotalCredit = sumC,
AccountId = grp.Key.AccountId,
FullName = grp.Key.FullName,
Id = grp.Key.Id
};
query.Where(p => p.TotalServiceCredit > 20);
The SQL query runs in approximately 3 seconds but I have yet to find the patience to let the Linq query finish. I was wondering if there is something different I should be doing to accomplish this "group, sum, having" query I'm trying to write? Is there something I can do to help Linq generate more performat SQL?
UPDATE
Turns out sgmoore had the right idea. The key to the performance issue was in his answer.
The difference between this
let sumC = grp.Select(x => x.CreditAmount).Sum()
and this
TotalCredit = grp.Sum(x => x.CreditAmount)
was the difference between a query that finishes and one that does not.
See my revised LINQ query below which completes in about the same time as the SQL (5.3 seconds for SQL vs 5.6 seconds for LINQ).
var query = from p in Person
join t in Transactions
on p.AccountId equalas t.AccountId
join c in Credits
on t.TransactionId = c.TransactionId
where p.Status == "Active" &&
p.Type = "AccountHolder" &&
t.CancelledDate == null &&
c.CancelledDate == null
group new { c.CreditAmount, t.AccountId, p.FullName, p.Id } by new { t.AccountId, p.FullName, p.SSN } into grp
select new
{
TotalCredit = grp.Sum(x => x.CreditAmount),
AccountId = grp.Key.AccountId,
FullName = grp.Key.FullName,
Id = grp.Key.Id
};
query.Where(p => p.TotalServiceCredit > 20);
Thanks for all your help!
I don't disagree with WEI_DBA's comment but if you need to do this, then you might find it easier to break this into several queries, eg
var query1 = from p in Person
join t in Transactions on p.AccountId equals t.AccountId
join c in Credits on t.TransactionId equals c.TransactionId
where p.Status == "Active" &&
p.Type = "AccountHolder" &&
t.CancelledDate == null &&
c.CancelledDate == null
select new { c.CreditAmount, t.AccountID, p.FullName, p.Id};
var query2 = (from p in query1
group p by new { p.AccountId, p.FullName, p.Id } into grp
select new
{
TotalCredit = grp.Sum(x => x.CreditAmount),
AccountId = grp.Key.AccountId,
FullName = grp.Key.FullName,
Id = grp.Key.Id
};
var query3 = (from p in query2 where p.TotalCredit > 20 select p);
Then you can let LINQ combine this into one sql command.
As always, it is a good idea to check and verify the actual TSQL generated.
I need to translate the following query from SQL into an Entity Framework query. Can anyone please help.
var query3 = string.Format(#"
SELECT DISTINCT
Boxes.BoxName,
Employees.EmployeeNumber,
Boxes.Port,
Boxes.SerialNumber
FROM
Eventlog
INNER JOIN Boxes
ON Eventlog.SerialNumber = Boxes.SerialNumber
INNER JOIN Employees
ON Eventlog.EmployeeId = Employees.EmployeeId
WHERE
ActionId = {4}
AND Boxes.Deactivated = 0
AND ( ('*' = '{0}')
OR (Boxes.SerialNumber = '{0}') )
AND ( (-1 = {1})
OR (Employees.EmployeeId = '{1}') )
AND EventTime >= '{2}'
AND EventTime <= '{3}'
", boxFilter3, ReportEmployeeIdFilter, ReportStartDate, ReportEndDate, actionFilter);
Something like this should work:
var query = (from log in context.Eventlog
join box in context.Boxes
on log.SerialNumber equals box.SerialNumber
join employee in context.Employees
on log.EmployeeId equals employee.EmployeeId
where log.ActionId == actionFilter
&& box.Deactivated == 0
&& (boxFilter3 == "*" || box.SerialNumber == boxFilter3)
&& (ReportEmployeeIdFilter == -1 || employee.EmployeeId == ReportEmployeeIdFilter)
&& log.EventTime >= ReportStartDate
&& log.EventTime <= ReportEndDate
select new
{
box.BoxName,
employee.EmployeeNumber,
box.Port,
box.SerialNumber
})
.Distinct();
How to convert INNER JOIN and LEFT JOIN in the following SQL query to LINQ to SQL? Thanks!
SELECT transactions.postdate,
transactions.clientkey AS TransClientKey,
transactions.type AS TransType,
clients.clientno,
Isnull(clients.nostmt, 0) AS CliNoStmt,
Isnull(aging.nostmt, 0) AS AgeNoStmt,
pmtchecks.*
FROM ((pmtchecks
INNER JOIN transactions
ON pmtchecks.transkey = transactions.transkey)
INNER JOIN clients
ON transactions.clientkey = clients.clientkey)
LEFT JOIN aging
ON ( transactions.clientkey = aging.clientkey )
AND ( pmtchecks.debtorkey = aging.debtorkey )
WHERE ( pmtchecks.debtorkey = 36927 )
AND ( transactions.status = 0 )
AND ( transactions.postdate <= '31-May-2012' )
AND ( ( transactions.postdate >= '01-May-2012' )
OR ( clients.clientno = 'UNKNOWN' ) )
ORDER BY pmtchecks.checkdate,
pmtchecks.checkno
Hi this is kind of dummy code i cnt say its exactly right but the idea will be exactly same to get the result
var anonymousType= (from pm in pmtchecks
join tr in transactions
on pm.transkey equals tr.transkey //INNERJOIN
join cl in clients
on tr.clientKey equals cl.clientKey
join ag in aging
on pm.debtorkey equals ag.debtorKey into ljoin //Left Join
from lj in ljoin.DefaultOrEmpty()
where pm.debortkey==36927 && tr.status==0 && tr.postdate<="31-May-2012" && tr.postdate>="01-May-2012" //u will have to change this to date format first
Select new {PostDate=tr.postdate, TransClientKey=tr.clientkey,TransType=tr.type,ClientNo=cl.clientno,CliNoStmt=cl.nomst ?? 0,AgeNoStmt=ag.nomst ??0,Pmtchecks=pm } //Anonymous type from this you can extract the values and fill to your custom type
).OrderBy(o=>o.Pmtchecks.checkdate).OrderBy(o=>o.Pmtchecks.checkno).ToList();
Hope this will help.
LINQ Query Samples
EDITED
var pmtchecks = from p in urcontext.pmtchecks
join t in urcontext.transactions on p.transkey equals t.transkey
join a in urcontext.aging on t.clientkey equals a.clientkey into details
from d in details.Where( a => ( a.debtorkey == p.debtorkey)).DefaultIfEmpty()
where (p.debtorkey == 36927 && t.status == 0 && t.postdate <= '31-May-2012'
&& (t.postdate >= '01-May-2012' || c.clientno == 'UNKNOWN' ))
orderby p.checkdate, p.checkno
select new
{
t.postdate,
t.clientkey,
// TransClientKey = t.clientkey, //only works if TransClientKey is property
t.type ,
//TransTypet = t.type ,//property
c.clientno,
c.nostmt,
//CliNoStmt = c.nostmt ?? 0,//property
a.nostmt//,
//AgeNoStmt = nostmt ?? 0,//property
//p. ... //follow above for p columns
};
I am almost done converting a MySQL app to Linq2SQL but struggling to get my head round this last SQL query
SELECT a.URL, b.URL AS DuplicateURL
FROM Pages a
INNER JOIN Pages b ON a.MetaDescription = b.MetaDescription
AND a.PageID <> b.PageID
WHERE a.DomainID = #reportid
AND b.DomainID = #reportid
AND LENGTH(TRIM(a.MetaDescription)) > 0
AND a.URL < b.URL
ORDER BY a.URL ASC
Could anymore give me some syntax help on how I would create this query in Linq2SQL?
Any help greatly appreciated
It goes like this:
var DuplicatePages =
from a in DBContext.Pages
join b in DBContext.Pages on a.MetaDescription equals b.MetaDescription
where (a.PageID <> b.PageID) && (a.DomainID == ReportID) &&
(b.DomainID == ReportID) && (a.MetaDescription.Trim().Length > 0) &&
(a.URL < b.URL)
orderby a.URL
select new { Url = a.URL, DuplicateUrl = b.URL };
That's pretty straigtforward:
var reportId = ...;
var duplicates =
from a in db.Pages
from b in db.Pages
where a.MetaDescription == b.MetaDescription
where a.PageID != b.PageID
where a.DomainID == reportId
where b.DomainID == reportId
where a.MetaDescription.Trim().Length > 0
where a.URL < b.URL
orderby a.URL
select new { Url = a.URL, DuplicateUrl = b.Url }