Select Query where multiple col1+col2 in ('value1','value2','value3')

Question

hello,
i've table :
month year .. other columns
1 2012
2 2012
1 2013
2 2013
1 2014
2 2014
I've multi select filter years, then months of these years as
1-year checkcombobox - all available years on the table. ex(2012,2013..)
2-month checkcombobox - all months for selected years above. ex(1-2013,2-2013..)
i want to select from my table where month & year = selected month & year. 
i used to do it like this : but i think i've problem with performance with this solution:
i use stored procedure with @monthyear nvarchar(max) parameter of selected months and year as text like '1-2012,2-2012,6-2013'
-i use 'uf_ParseDelimitedString2' function to extract above string into table of string.
the query:
select from mytable where convert(nvarchar(10),mytable.month) + '-' + convert(nvarchar(10),mytable.year) in (select string from uf_ParseDelimitedString2(@monthyear))
-function i used on above query to Parse Delimited String and return table of string.
ALTER FUNCTION [dbo].[uf_ParseDelimitedString2](@strToParse VARCHAR(MAX)) RETURNS @tblStrToParse TABLE
(string nvarchar(max))
AS
BEGIN
DECLARE @pos int
DECLARE @piece nvarchar(max)
-- Need to tack a delimiter onto the end of the input string if one doesn't exist
IF RIGHT(RTRIM(@strToParse),1) <> ','
SET @strToParse = @strToParse + ','
SET @pos = PATINDEX('%,%' , @strToParse)
WHILE @pos <> 0
BEGIN
SET @piece = left(@strToParse, @pos - 1)
-- You have a piece of data, so insert it, print it, do whatever you want to with it.
INSERT INTO @tblStrToParse VALUES(@piece)
SET @strToParse = STUFF(@strToParse, 1, @pos, '')
SET @pos = patindex('%,%' , @strToParse)
END
RETURN
END
thank your in advance ..

Answer 1

hi.. 
review this after i created a function:
create FUNCTION [dbo].[uf_ParseDelimitedString2Col](@t VARCHAR(MAX))
RETURNS @tblStrToParse TABLE
([1] int ,[2] int)
AS
BEGIN
insert into @tblStrToParse
SELECT [1], [2]
FROM (
SELECT
t2.id
, t2.name
, rn2 = ROW_NUMBER() OVER (PARTITION BY t2.id ORDER BY 1/0)
FROM (
SELECT
id = t.c.value('@n', 'INT')
, name = t.c.value('@s', 'nvarchar(20)')
FROM (
SELECT x = CAST('<t s = "' +
REPLACE(token + '-', '-', '" n = "' + CAST(rn AS VARCHAR(10))
+ '" /><t s = "') + '" />' AS XML)
FROM (
SELECT
token = t.c.value('.', 'VARCHAR(100)')
, rn = ROW_NUMBER() OVER (ORDER BY 1/0)
FROM (
SELECT x = CAST('<t>' + REPLACE(@t, ',', '</t><t>') + '</t>' AS XML)
) r
CROSS APPLY x.nodes('/t') t(c)
) t
) d
CROSS APPLY x.nodes('/t') t(c)
) t2
WHERE t2.name != ''
) t3
PIVOT (
MAX(name) FOR rn2 IN ([1], [2])
) p
Return
END
then 
i used this code.. 
select * from mytable st cross apply dbo.uf_ParseDelimitedString2Col('1-2014,3-2014') x where st.month = x.[1] and st.year = x.[2]
how about that..
thank you.