We Keep Coding

Conversion of Sql query to linq

I am trying to convert sql query for select to linq query using EF in MVC but really got stuck with an error.
In SQL I'm able to get 6 records for my query,similarly when I try to convert this to linq it shows some error.
Following is my query in SQL:
SELECT
PurchaseOrderMaster.*, PurchaseOrderDetails.*, Vendor.*,
BusinessUnit.*, InvoiceMaster.*, TenantEmployee.*
FROM
PurchaseOrderMaster
INNER JOIN
PurchaseOrderDetails ON PurchaseOrderMaster.TenantID = PurchaseOrderDetails.TenantID
AND PurchaseOrderMaster.PurchaseOrderNumber = PurchaseOrderDetails.PurchaseOrderNumber
AND PurchaseOrderMaster.PurchaseOrderDate = PurchaseOrderDetails.PurchaseOrderDate
INNER JOIN
InvoiceMaster ON PurchaseOrderMaster.TenantID = InvoiceMaster.TenantID
AND PurchaseOrderMaster.PurchaseOrderNumber = InvoiceMaster.PurchaseOrderNumber
AND PurchaseOrderMaster.PurchaseOrderDate = InvoiceMaster.PurchaseOrderDate
INNER JOIN
BusinessUnit ON PurchaseOrderMaster.TenantID = BusinessUnit.TenantID
AND PurchaseOrderMaster.BusinessUnitID = BusinessUnit.BusinessUnitID
INNER JOIN
TenantEmployee ON PurchaseOrderMaster.TenantID = TenantEmployee.TenantID
INNER JOIN
Vendor ON PurchaseOrderMaster.TenantID = Vendor.TenantID
AND PurchaseOrderMaster.VendorID = Vendor.VendorID
For this query I am able to get 6 records .
And my linq query is:
return (from pom in db.PurchaseOrderMaster
join pod in db.PurchaseOrderDetails on pom.TenantID equals pod.TenantID
where pom.PurchaseOrderNumber == pod.PurchaseOrderNumber && pom.PurchaseOrderDate == pod.PurchaseOrderDate
join inv in db.InvoiceMaster on pom.TenantID equals inv.TenantID
where pom.PurchaseOrderNumber == inv.PurchaseOrderNumber && pom.PurchaseOrderDate == inv.PurchaseOrderDate
join bu in db.BusinessUnit on pom.BusinessUnitID equals bu.BusinessUnitID
join te in db.TenantEmployee on pom.TenantID equals te.TenantID
join v in db.Vendor on pom.TenantID equals v.TenantID
where pom.VendorID == v.VendorID
orderby pom.PurchaseOrderNumber ascending, pom.PurchaseOrderDate descending
select new { pom, pod, inv, bu, te, v }).ToList();
At the time of debugging,following is the error that I'm getting:
{"Invalid column name 'invoiceMasterModel_TenantID'.\r\nInvalid column name 'invoiceMasterModel_PurchaseOrderNumber'.\r\nInvalid column name 'invoiceMasterModel_PurchaseOrderDate'.\r\nInvalid column name 'invoiceMasterModel_InvoiceNumber'.\r\nInvalid column name 'invoiceMasterModel_InvoiceDate'.\r\nInvalid column name 'tenantEmployeeModel_TenantID'.\r\nInvalid column name 'tenantEmployeeModel_EmployeeID'."}
Inside Invoice Table it is not able to find some of the columns and hence throwing the error according to me..
I tried with many possible ways but was unable to solve this.
Any ideas..?

Problem was with my Entity.
What I did is,I added my entity again and according to that I recreated models for the associated tables removing the earlier ones.
It solved my problem finally .

I found this link Entity Framework 5 Invalid Column Name error related to somewhat similar problem.
Here also similar kind of error happened after the date time field. Check if your datetime field PurchaseOrderDate is nullable.

Many tools exist that can convert your sql queries to linq, in case you don't wanna write it urself. Try the following sites, works well in my case:
http://www.sqltolinq.com/
http://www.linqpad.net/

MS Access Database SQL Query

I have 3 Tables called Invoice, Customer and Company. I want to merge this 3 tables into single using Query. In Invoice Table contain Customer Id and Company Id. How to Join 3 tables ?
I tried Invoice and Customer Table working fine with this query. But I dont have idea to add 3rd table with this.
SELECT RPT_Invoice_Less.InvoiceNumber, RPT_Invoice_Less.Terms,
RPT_Invoice_Less.Invoicedate, RPT_Invoice_Less.OurQuote,
RPT_Invoice_Less.SalesPerson, RPT_Customer.CustomerName,
RPT_Customer.CustomerId, RPT_Customer.ContactPerson,
RPT_Customer.BillingAddress, RPT_Customer.DeliveryAddress,
RPT_Invoice_Less.OrderNumber, RPT_Invoice_Less.ShippingBy,
RPT_Invoice_Less.ShipReferenceNo, RPT_Invoice_Less.Notes,
RPT_Invoice_Less.Price, RPT_Invoice_Less.Discount,
RPT_Invoice_Less.Shipping, RPT_Invoice_Less.Tax,
RPT_Invoice_Less.GrandTotal, RPT_Invoice_Less.Company
FROM RPT_Invoice_Less
INNER JOIN RPT_Customer
ON RPT_Invoice_Less.CustomerId = RPT_Customer.CustomerId;
this code working fine for 2 tables
SELECT RPT_Invoice_Less.InvoiceNumber, RPT_Invoice_Less.Terms, RPT_Invoice_Less.Invoicedate, RPT_Invoice_Less.OurQuote, RPT_Invoice_Less.SalesPerson, RPT_Customer.CustomerName, RPT_Customer.CustomerId, RPT_Customer.ContactPerson, RPT_Customer.BillingAddress, RPT_Customer.DeliveryAddress, RPT_Invoice_Less.OrderNumber, RPT_Invoice_Less.ShippingBy, RPT_Invoice_Less.ShipReferenceNo, RPT_Invoice_Less.Notes, RPT_Invoice_Less.Price, RPT_Invoice_Less.Discount, RPT_Invoice_Less.Shipping, RPT_Invoice_Less.Tax, RPT_Invoice_Less.GrandTotal, RPT_OrionSystem.Company, RPT_OrionSystem.CompanyId
FROM RPT_Invoice_Less
INNER JOIN RPT_Customer
ON RPT_Invoice_Less.CustomerId = RPT_Customer.CustomerId
INNER JOIN RPT_OrionSystem
ON RPT_Invoice_Less.CompanyId = RPT_OrionSystem.CompanyId;
This code showing syntax error.
Help me to add 3rd Company table to this.

Supposing that you have a CompanyID field (or something like that) in the RPT_Customer table or in the RPT_Invoice_Less, it is just a matter to add another INNER JOIN
....
FROM ((RPT_Invoice_Less
INNER JOIN RPT_Customer
ON RPT_Invoice_Less.CustomerId = RPT_Customer.CustomerId)
INNER JOIN RPT_OrionSystem
ON RPT_Invoice_Less.CompanyID = RPT_OrionSystem.CompanyID)

SQL Server : INNER JOIN writes out things two times

Here is my SQL query
select
tblUnderKategori.fldKategori,
tblUnderKategori.fldNavn,
tblUnderKategori.fldBillede,
tblKategori.fldId,
tblKategori.fldKategoriNavn
from
tblUnderKategori
inner join
tblKategori on tblUnderKategori.fldKategori=2
And as you can see I need everything where my fldKategori = 2, and so it does, but it writes it out x2 times.
And here is my backend code for the place where it needs to be displayed
katFac objKat = new katFac();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack && !string.IsNullOrEmpty(Request.QueryString["id"]))
{
foreach (DataRow item in objKat.GetUnderkatByKat(Convert.ToInt32(Request.QueryString["id"])).Rows)
{
litUnderkategori.Text += item["fldNavn"].ToString() + "<br /><br />";
}
}
}
I just can't seeme to figure out the problem so anyone please help
Thank you in advance! :)

You are creating a karthesian product here as your join is missing the condition that actually joins the two tables together.
Try to use this:
select
tblUnderKategori.fldKategori,
tblUnderKategori.fldNavn,
tblUnderKategori.fldBillede,
tblKategori.fldId,
tblKategori.fldKategoriNavn
from
tblUnderKategori
inner join tblKategori
on tblUnderKategori.fldKategori = tblKategori.fldId
where tblUnderKategori.fldKategori=2
This assumes that tblUnderKategori.fldKategori contains the ID of the parent category.

A JOIN joins two tables, and you must provide the common column. If you also want to filter out certain values, add a WHERE clause afterwards. Also, you don't actually have to SELECT the fields used for matching and joining if you don't explicitly want to read them later on.
select
tblUnderKategori.fldNavn,
tblUnderKategori.fldBillede,
tblKategori.fldKategoriNavn
from tblUnderKategori join tblKategori
on tblUnderKategori.fldKategori = tblKategori.fldId
where
tblUnderKategori.fldKategori = 2

ON clause specifies on which column that tables should be joined, condition should be included in WHERE clause. Try Something like this:
SELECT
tblUnderKategori.fldKategori,
tblUnderKategori.fldNavn,
tblUnderKategori.fldBillede,
tblKategori.fldId,
tblKategori.fldKategoriNavn
FROM tblUnderKategori
INNER JOIN tblKategori
ON tblUnderKategori.[some key column] = tblKategori.[corresponding key column]
WHERE tblUnderKategori.fldKategori=2

You SQL statement is missing a field to JOIN the tables on. It should be something like this:
select u.fldKategori,
u.fldNavn,
u.fldBillede,
k.fldId,
k.fldKategoriNavn
from tblUnderKategori u
inner join tblKategori k
on u.fldKategori = k.fldId
where u.fldKategori=2
Then you will apply your filter in the the WHERE clause.

How do I use multiple IDs from a table with an INNER JOIN using SQL?

I have a list of SiteUsers in one table and another table has columns with different types of owners (ID) for the record. For example, the SiteUserID in the SiteUsers table will be used for the SalesRepID, the StaffingManagerID, and RecruiterID in the Fill table. Of course, the SiteUserID is different for each of the values in the Fill table.
I'd like to return the name of the SiteUser for each ID column in the Fill Table.
How do I properly construct a JOIN statement to do this?
I'm guessing this is done through INNER JOIN, but I'm not sure.
My current select statement already has an INNER JOIN as I'm pulling the name of the FillType from another table. I'm using this in an asp.net application.
I'm not sure if this is even possible. Any help is appreciated.

Since each of the IDs in the Fills table allows null, you probably want to LEFT JOIN to the SiteUsers table like so:
SELECT f.FillID, s1.SiteUserLastName 'SalesRep', s2.SiteUserLastName 'StaffingManager', s3.SiteUserLastName 'Recruiter'
FROM Fills f
LEFT JOIN SiteUsers s1 on f.SalesRepID = s1.SiteUserID
LEFT JOIN SiteUsers s2 on f.StaffingManagerID = s2.SiteUserID
LEFT JOIN SiteUsers s3 on f.RecruiterID = s3.SiteUserID

You can always UNPIVOT the results like so:
SELECT
DISTINCT
unpvt.FillID
,unpvt.RepID
,unpvt.RepType
,s.SiteUserFirstName
,s.SiteUserLastName
FROM
(SELECT
FillID
,SalesRepID
,StaffingManagerID
,RecruiterID
FROM Fills
) f
UNPIVOT
(RepID FOR RepType IN
(SalesRepID, StaffingManagerID,RecruiterID)
) AS unpvt
JOIN SiteUsers AS s on unpvt.RepID = s.SiteUserID`
Obviously you can play with exact output (such as substituting the RepType for a different value with a CASE statement or whatnot.
My question is: why the piss-poor design? Instead of having three IDs in the Fills table, you should have a junction table between SiteUsers and Fills to allow many-to-many relationships. IF it were designed with a junction table, you'd never have had to ask this question.

You will have to join the Fill table with the SiteUsers table multiple times, one for each xxxID column in the Fills for which you want the SiteUser name and combine the results using an union as below:
select a.SiteUserId, a.SiteUserFirstName, a.SiteUserLastName
from dbo.SiteUsers a
inner join dbo.Fills b on b.SalesRepId = a.SiteUserId
UNION
select a.SiteUserId, a.SiteUserFirstName, a.SiteUserLastName
from dbo.SiteUsers a
inner join dbo.Fills b on b.StaffingManagerId = a.SiteUserId
UNION
select a.SiteUserId, a.SiteUserFirstName, a.SiteUserLastName
from dbo.SiteUsers a
inner join dbo.Fills b on b.RecruiterId = a.SiteUserId

How do I join tables with a condition using LLBLGen?

I have the following Sql Query that returns the type of results that I want:
SELECT b.ID, a.Name, b.Col2, b.COl3
FROM Table1 a
LEFT OUTER JOIN Table2 b on b.Col4 = a.ID AND b.Col5 = 'test'
In essence, I want a number of rows equal to Table1 (a) while having the data from Table2 (b) listed or NULL if the condition, 'test', doesn't exist in Table2.
I'm rather new to LLBLGen and have tried a few things and it isn't working. I can get it to work if the condition exists; however, when a requirements change came in and caused me to rewrite the query to that above, I'm at a loss.
Below is the old LLBLGen C# code that worked for existing products but not for the above query:
LookupTable2Collection table2col = new LookupTable2Collection();
RelationCollection relationships = new RelationCollection();
relationships.Add(LookupTable2Entity.Relations.LookupTable1EntityUsingTable1ID, JoinHint.Left);
IPredicateExpression filter = new PredicateExpression();
filter.Add(new FieldCompareValuePredicate(LookupTable2Fields.Col5, ComparisonOperator.Equal, "test"));
table2col.GetMulti(filter, relationships);
Table 1 has 3 records in it. I need the 3 records back even if all items from Table 2 are NULL because the condition doesn't exist. Any ideas?

You've to add your filter to the relation join like this:
relationships.Add(LookupTable2Entity.Relations.LookupTable1EntityUsingTable1ID, JoinHint.Left).CustomFilter = new FieldCompareValuePredicate(LookupTable2Fields.Col5, ComparisonOperator.Equal, "test");