Covert SQL to Linq Query - sql

Question

I am doing my final year's project, I am new to linq as well. I have an SQL statement which i want to convert it to linq. I am currently using .net core.
I will greatly appreciate any help ,
WITH
cte_company (CompanyID, CompanyName, CompanyNumber, IncorporatedDate, TOTAL_YEARS) AS
(
SELECT
CompanyID,
CompanyName,
CompanyNumber,
IncorporatedDate,
DATEDIFF(YEAR, IncorporatedDate, CURRENT_TIMESTAMP) AS TOTAL_YEARS
FROM tbl_Company
)
SELECT
cte_company.CompanyID,
CompanyName,
CompanyNumber,
IncorporatedDate,
TOTAL_YEARS,
CASE
WHEN TOTAL_YEARS > 1 THEN (SELECT
DATEADD(MONTH, 9, MAX(TaxReturnDate))
FROM tbl_Tax
WHERE cte_company.CompanyID = tbl_Tax.CompanyID)
ELSE DATEADD(MONTH, 21, IncorporatedDate)
END AS TaxDate
FROM cte_company
I tried :
var result = (from comp in this.AccountDB.TblCompanies
where comp.CompanyStatus == true && comp.UserName == username
join tax in this.AccountDB.TblTaxes
on comp.CompanyId equals tax.CompanyId
orderby tax.TaxReturnDate descending
select new CompanyTaxInfo
{
CompanyName = comp.CompanyName,
CompanyID = comp.CompanyId,
CompanyNumber = comp.CompanyNumber,
})
.ToList();

Answer 1

As far as I can tell, the value read from tbl_tax is constant, which means it can be reduced to this:
var taxReturnDate = tbl_tax.Max(tx=>tx.TaxReturnDate).AddMonths(9);
var result = from c in tbl_Company
let TotalYears = (DateTime.Now - c.IncorporatedDate).Days / 365
select new
{
CompanyID = c.CompanyID,
c.CompanyName,
c.CompanyNumber,
c.IncorporatedDate,
TotalYears,
TaxDate = TotalYears > 1 ? taxReturnDate : c.IncorporatedDate.AddMonth(9)
}

Answer 2

You could still use your SQL with EF and still get the same result
for example if you create a stored procedure for your SQL
you could call it as the following
var result = await dbContext.<Your-Result-set>.FromSqlInterpolated(#$"[dbo].[Your-Procedure-Name]
{your-parameter1}
,{your-parameterN}
").ToListAsync();