Flat table in SQL query - sql

Question

I have a query that returns two rows:
X Y
20 0.148698
30 0.576208
I also have a function with following signature:
ALTER FUNCTION [dbo].[SomeFunc]
(
#x1 float,
#y1 float,
#x2 float,
#y2 float
)
What is the easiest way to pass params from this query in this function? Now i have a query, that declares four local variables and then I do four queries to fill all these variables and only then pass them into my function. But it seems that there is some better solution. For example I'm looking for something like:
WITH CTE AS (
SELECT X1 = ..., Y1 = ..., X2 = ..., Y2 = ...
)
SELECT TOP 1 SomeFunc(X1, Y1, X2, Y2)
FROM CTE
This is why I called this question Table flat
Entire query is:
DECLARE #value float = 24;
WITH CTE AS (
SELECT X = CAST([name] AS float),
Y = [rank]
FROM [issdss].[dbo].[crit_scale]
WHERE criteria_id = 128
),
CTE2 as (
SELECT CTE.*, LeftDiff = IIF(X <= #value, #value - X, NULL), RightDiff = IIF(X >= #value, X - #value, NULL)
FROM CTE
),
CTE3 as (
SELECT X, Y
FROM CTE2
WHERE LeftDiff = (SELECT MIN(LeftDiff) FROM CTE2)
OR RightDiff = (SELECT MIN(RightDiff) FROM CTE2)
),
-- Some magic here to get X1,Y1,X2,Y2

Answer 1

If there's always 2 rows, you can do something like this with row_number & max:
select
max(case when RN = 1 then X end) as X1,
max(case when RN = 2 then X end) as X2,
max(case when RN = 1 then Y end) as Y1,
max(case when RN = 2 then Y end) as Y2
from (
select row_number () over (order by (select null)) RN, *
from (
select 20 as X, 0.148698 as Y
union all
select 30, 0.576208
) X
) Y
Example in SQL Fiddle