LINQ query where column contains a specific number >= specific value you want to query - sql

Question

I have a table named SubcodeTable and I want to query in SubsidiaryCode where first 3characters is >= to 21Y
Query in table where a column contains >= '21Y'
SubcodeTable:
Column1 Column2
SubsidiaryCode Desc
18Y-001 AAA
19Y-001 AAA
20Y-001 AAA
21Y-001 CCC
22Y-003 EEE
23Y-001 FF
So output should display:
Column1 Column2
SubsidiaryCode Desc
21Y-001 CCC
22Y-003 EEE
23Y-001 FF
By the way first 3 characters of SubsidiaryCode represent year like 21Y=2021.
I manage to create a SQL query, so how do to it in LINQ query ?
SQL query:
SELECT LEN (Whh_SubsidiaryCode) [StringLength],LEFT(Whh_SubsidiaryCode,2)[FirsttwoCharInSubCode]
,Whd_WHNo [RR NUMBER], Whh_SubsidiaryCode [SubsidiaryCode], Whd_WHSeqNo [SEQ], Whd_WHSplitSeqNo [SPLIT SEQ] ,Whd_WHIssuedQty [QTY],Saw_StockName [ITEM NAME],Saw_StockSpecs1 [ASSET DESCRIPTION]
FROM E_WHDetailEntry
JOIN E_WHHeaderEntry ON Whd_WHNo=Whh_WHNo
JOIN E_StockAndWorkMaster ON Whd_StockCode=Saw_StockCode
WHERE Whd_StockType='FS2'
AND Whh_SubsidiaryCode LIKE '%Y%' AND LEFT(Whh_SubsidiaryCode,2) >= '21'
ORDER BY Whh_SubsidiaryCode
So this is my LINQ query, I tried to use y.Whh_SubsidiaryCode.Substring(0,2) >'20' but it says Too many characters in car literal & operator > cannot be applied to operands of type string and char.
private List<string> GetBudgetCodes()
{
using (var ctx = LinqExtensions.GetDataContext<NXpert.FixedAsset.DataAccess.FixedAssetDataContext>("AccountingDB"))
{
var list = (from x in ctx.DataContext.E_WHDetailEntries
join y in ctx.DataContext.E_WHHeaderEntries
on x.Whd_WHNo equals y.Whh_WHNo
where x.Whd_StockType == "FS2"
&& y.Whh_SubsidiaryCode.Contains("y")
&& y.Whh_SubsidiaryCode.Substring(0,2) >= '21'
select new { y.Whh_SubsidiaryCode }
).DistinctBy(y => y.Whh_SubsidiaryCode).OrderBy(y => y.Whh_SubsidiaryCode).ToList();
var budgetcode = list.Select(y => y.Whh_SubsidiaryCode.Trim()).ToList();
return budgetcode;
}
}

Answer 1

As it says in exception
> cannot be applied to operands of type string and char.
You need to parse Whh_SubsidiaryCode first to be able to compare values.
So this
&& y.Whh_SubsidiaryCode.Substring(0,2) >= '21'
should be like this:
&& Convert.ToInt32(y.Whh_SubsidiaryCode.Substring(0,2)) > 21

Answer 2

y.Whh_SubsidiaryCode.Substring(0,2) >'20' but it says
Too many characters in char literal
Indeed; you can only put one character inside ' in C#. If you want to put more than one character, you need a string, which is delimited by "
Operator > cannot be applied to operands of type string and char
> as a maths operation doesn't work with a string on one side and a char on the other. You can use it on two chars, or on two strings, but not on a mix
'a' > 'b' //false
"a" > "b" //false
"a" > "A" //true - a is ASCII 97, A is ASCII 65. 97 is greater than 65
I'd say you can simply use:
y.Whh_SubsidiaryCode >= "21Y"
if your code is always number number Y, but you should be aware that this is an alphameric comparison. It'll work fine for any other code that is also number number Y. Critically, a string of 100Y is not greater than 21Y because the first character, 1 is not greater than 2
Unless you have other codes like 21X, you can dump the LIKE '%Y%' / Contains("y") - that just slows things down

Answer 3

I finally gotten a solution in SQL.
by using LEN then get the length then using LEFT to get the first 2 char.
Then create a where clause for the condition:
LEFT(Whh_SubsidiaryCode,2) >= '20'
SELECT LEN (Whh_SubsidiaryCode) [StringLength],LEFT(Whh_SubsidiaryCode,2)[FirsttwoCharInSubCode]
,Whd_WHNo [RR NUMBER], Whh_SubsidiaryCode [SubsidiaryCode], Whd_WHSeqNo [SEQ], Whd_WHSplitSeqNo [SPLIT SEQ] ,Whd_WHIssuedQty [QTY],Saw_StockName [ITEM NAME],Saw_StockSpecs1 [ASSET DESCRIPTION]
FROM E_WHDetailEntry
JOIN E_WHHeaderEntry ON Whd_WHNo=Whh_WHNo
JOIN E_StockAndWorkMaster ON Whd_StockCode=Saw_StockCode
WHERE Whd_StockType='FS2'
AND Whh_SubsidiaryCode LIKE '%Y%' AND LEFT(Whh_SubsidiaryCode,2) >= '20'
ORDER BY Whh_SubsidiaryCode
Thanks for the help guys.
About the LINQ I manage to query the results using List, create a function that returns the met condition.
Code:
private static bool CodeFiltered(string code)
{
return ((Convert.ToInt32(code.Substring(0,2)) >= 20));
}
var lstBudgetCodes = GetBudgetCodes();
List<string> ResultCode =new List<string>(lstBudgetCodes.FindAll(CodeFiltered));