SQL Running Percentage - mysql

Question

I have the following data in an MySQL database:
User_ID | Film | Choice
Where choice is either 1 or 0. I would like to create a google chart with the percentage choice (1s) after each film. I can produce this in excel as below:
Is there a way to produce a result which has these running totals, without creating a new column in the table? (similar to SUM)
First row should be 1 but set to 0 just to make the graph look better!

Answer 1

Assuming #fancyPants is right (ususally is), then you can also write that this way (slightly simpler and less scalable)...
SELECT x.*
, SUM(y.choice)/COUNT(*) * 100 pct
FROM film_choice x
JOIN film_choice y
ON y.film <= x.film
GROUP
BY x.film;

Answer 2

The first row should be 100%, right? 1 vote, 1 yes equals 100%
create table runningp(id int auto_increment primary key, choice tinyint);
insert into runningp(choice) values (1),(0),(0),(1),(1),(0),(1),(1),(0),(0);
select r.*, #p:=#p+choice, #t:=#t+1, #p/#t as yes
from runningp r,
(select #p:=0, #t:=0) v
order by id;
+----+--------+---------------+----------+--------+
| id | choice | #p:=#p+choice | #t:=#t+1 | yes |
+----+--------+---------------+----------+--------+
| 1 | 1 | 1 | 1 | 1.0000 |
| 2 | 0 | 1 | 2 | 0.5000 |
| 3 | 0 | 1 | 3 | 0.3333 |
| 4 | 1 | 2 | 4 | 0.5000 |
| 5 | 1 | 3 | 5 | 0.6000 |
| 6 | 0 | 3 | 6 | 0.5000 |
| 7 | 1 | 4 | 7 | 0.5714 |
| 8 | 1 | 5 | 8 | 0.6250 |
| 9 | 0 | 5 | 9 | 0.5556 |
| 10 | 0 | 5 | 10 | 0.5000 |
+----+--------+---------------+----------+--------+
To just select what you need:
select id, choice, yes from (
select r.*, #p:=#p+choice, #t:=#t+1, #p/#t as yes
from runningp r,
(select #p:=0, #t:=0) v
order by id
) sq
order by id;
+----+--------+--------+
| id | choice | yes |
+----+--------+--------+
| 1 | 1 | 1.0000 |
| 2 | 0 | 0.5000 |
| 3 | 0 | 0.3333 |
| 4 | 1 | 0.5000 |
| 5 | 1 | 0.6000 |
| 6 | 0 | 0.5000 |
| 7 | 1 | 0.5714 |
| 8 | 1 | 0.6250 |
| 9 | 0 | 0.5556 |
| 10 | 0 | 0.5000 |
+----+--------+--------+
10 rows in set (0.00 sec)