Create a mysql function that accepts a result set as parameter? - mysql

Question

Is it possible to create a mySQL function that accepts as a parameter the result set from a query?
Basically I have a lot of queries that will return a result result set as follows:
id | score
70 | 25
71 | 7
72 | 215
74 | 32
75 | 710
76 | 34
78 | 998
79 | 103
80 | 3
I want to normalize the values such that they come to a range between 0 and 1.
The way I thought I'd do this was by applying calculation:
nscore = (score-min(score))/(max(score) - min(score))
to get following result
id | score
70 | 0.022
71 | 0.004
72 | 0.213
74 | 0.029
75 | 0.710
76 | 0.031
78 | 1.000
79 | 0.100
80 | 0.000
But I'm not able to come up with a query to get the min and max in this query along with results, hence thought of using a function (cannot use stored procedure) but couldn't documentation on how to pass a result set.
Any help appreciated!Thanks!
EDIT:
The score field in result is a computed field. Cannot select it directly.
For eg: Sample query that returns the above result -
select t.id as id, count(*) as score
from tbl t
inner join tbl2 t2 on t.idx = t2.idx
where t2.role in (.....)
just for demo purpose, not actual schema or query

Answer 1

No. MySQL doesn't support defining a function with a resultset as an argument.
Unfortunately, MySQL does not support Common Table Expression (CTE), and does not support Analytic functions.
To get this result from a MySQL query... one way to do that in MySQL would require the original query to be returned as an inline view, two times ...
As an example:
SELECT t.id
, (t.score-s.min_score)/(s.max_score-s.min_score) AS normalized_score
FROM (
-- original query here
SELECT id, score FROM ...
) t
CROSS
JOIN ( SELECT MIN(r.score) AS min_score
, MAX(r.score) AS max_score
FROM (
-- original query here
SELECT id, score FROM ...
) r
) s
ORDER BY t.id
EDIT
Based on the query added to the question ...
SELECT q.id
, (q.score-s.min_score)/(s.max_score-s.min_score) AS normalized_score
FROM ( -- original query goes here
-- ------------------------
select t.id as id, count(*) as score
from tbl t
inner join tbl2 t2 on t.idx = t2.idx
where t2.role in (.....)
-- ------------------------
) q
CROSS
JOIN ( SELECT MIN(r.score) AS min_score
, MAX(r.score) AS max_score
FROM ( -- original query goes here
-- ------------------------
select t.id as id, count(*) as score
from tbl t
inner join tbl2 t2 on t.idx = t2.idx
where t2.role in (.....)
-- ------------------------
) r
) s
ORDER BY q.id