Sum until certain value - mysql

Question

i've tried some other topics for this but couldn't get answers that actually worked for me.
I have a activities table with some values ( in mysql)
| id| user_id | elevation | distance |
|---|------------|--------------------|----------|
| 1 | 1 | 220 | 5000 |
| 2 | 1 | 300 | 7000 |
| 3 | 2 | 520 | 2000 |
| 4 | 2 | 120 | 3500 |
I need to sum distance and elevation until distance sum up to certain value, per user_id.
Example, sum until 5000 is reached:
User 1 - distance 5000 - elevation 220
User 2 - distance 5500 - elevation 640
I found many solutions but none with group_by. How i do this in mysql?
Update : I used that query but now i'm with another problem. The join always use the insert order, and not a datetime field i want.
SELECT
t.*
FROM
(
SELECT
t.*,
(
#d := #d + DISTANCE
) AS running_distance
FROM
(
SELECT
t.*,
c.meta
FROM
inscricao i
INNER JOIN categorias c ON
i.categoria_id = c.id
LEFT JOIN(
select
t.data_inicio,t.usuario_id,t.aplicativo,t.data_fim,t.distance,t.tempo_decorrido,t.ritmo_cardiaco,t.velocidade_media,t.type,t.ganho_de_altimetria
from
corridas t
order by
data_inicio asc
) t ON
t.usuario_id = i.usuario_id
AND t.data_inicio >= i.inicio
AND t.data_fim <= i.fim
WHERE
i.desafio_id = 29
AND(
i.usuario_id = 5354
)
ORDER BY
data_inicio asc
-- usuario_id
) t
join (
SELECT
#u :=- 1,
#d := 0
) params
ORDER BY
data_inicio asc
) t
WHERE
(
running_distance >= meta * 1000
AND running_distance - DISTANCE < meta * 1000
)
OR(
running_distance <= meta * 1000
)
order by
data_inicio desc
So if a older activity is inserted after, the sum gets wrong. Someone knows how to handle it?

Answer 1

You can use variables to get the cumulative sum . . . then some simple filtering logic:
select t.*
from (select t.*,
(#d := if(#u = user_id, #d + distance,
if(#u := user_id, distance, distance)
)
) as running_distance -- pun intended ??
from (select t.*
from t
order by user_id, id
) t cross join
(select #u := -1, #d := 0) params
) t
where running_distance >= 5000 and
running_distance - distance < 5000;
Notes:
The more recent versions of MySQL are finicky about variable assignment and order by. The innermost subquery is not needed in earlier versions of MySQL.
MySQL does not guarantee the order of evaluation of expressions in a select. Hence, all variable assignments are in a single expression.
If distance can be negative, then a user may have more than one row in the result set.
This is not an aggregation query.