Help with a sql search query using a comma delimitted parameter

Question

I am looking for something like this but can\'t figure out the best way to write the query:

SELECT DISTINCT CategoryID FROM tbl_Categories c INNER JOIN 
  ma         


        

Answer 1

-- Parameter string
declare @ParamStr varchar(100) = '234,245,645'

-- Convert param to xml
declare @XMLStr xml = convert(xml, ''+replace(@ParamStr, ',', '')+'')

-- Store param values in table variable
declare @T table (ID int)
insert into @T 
select r.value('.', 'int')
from @XMLStr.nodes('r') r(r)

-- Get the number of parameters
declare @ParamCount int = (select count(*) from @T)

-- Get the categoryids
select CategoryID
from mappingTable
where SubCategoryID in (select id from @T)
group by CategoryID
having count(CategoryID) = @ParamCount