fn_CheckStringExistence

        create function dbo.fn_CheckStringExistence
        (
          @StrToCheck NVARCHAR(MAX),
          @InStr NVARCHAR(MAX)
        )
        returns bit
        as
        begin
          declare @IsExists bit = 0
          select @IsExists = cast(case when count(1) = 0 then 0 else 1 end as bit)
          from dbo.fn_GetTableFromStringWithSep(@StrToCheck, ',') Fn1
          inner join dbo.fn_GetTableFromStringWithSep(@InStr, ',') Fn2
          on Fn1.Val = Fn2.Val
          return (@IsExists)
        end