select group by dimension and accumulate column percent - clickhouse

Question

I've using ClickHouse and I have this table
| URL | visits |
| ------------- |:------------- |
| URL1 | 5 |
| URL2 | 30 |
| URL3 | 1 |
| URL4 | 30 |
| URL5 | 9 |
| URL1 | 5 |
| URL2 | 20 |
I can group by url,
select
url,
sum(visits) as visits
from
database.tableVistis
group by
url
| URL | visits |
| ------------- |:------------- |
| URL1 | 10 |
| URL2 | 50 |
| URL3 | 1 |
| URL4 | 30 |
| URL5 | 9 |
And I want this result (group by url, % over total of visits, and % sum accumulate)
| URL | visits | % | Accumulate |
| ------------- |:------------- |----------|------------|
| URL2 | 50 |50% | 50% |
| URL4 | 30 |30% | 80% |
| URL1 | 10 |10% | 90% |
| URL5 | 9 |9% | 99% |
| URL3 | 1 |1% | 100% |
Any idea?
Thanks!!

Answer 1

Try this query:
SELECT result.1 AS URL, result.2 AS visits, round(result.3,2) AS "%", round(result.4, 2) AS Accumulate
FROM (
SELECT
groupArray((URL, visits)) url_visits,
arraySum(x -> x.2, url_visits) total_visits,
arrayMap(x -> (100 / total_visits) * x.2, url_visits) percent_visits,
arrayCumSum(percent_visits) acc_percent_visits,
arrayJoin(arrayMap((x, y, z) -> (x.1, x.2, y, z), url_visits, percent_visits, acc_percent_visits)) result
FROM (
SELECT URL, sum(visits) visits
FROM (
/* test data */
SELECT data.1 URL, data.2 visits
FROM (
SELECT arrayJoin([
('URL1', 5 ),
('URL2', 30),
('URL3', 1 ),
('URL4', 30),
('URL5', 9 ),
('URL1', 5 ),
('URL2', 20)]) data))
GROUP BY URL
ORDER BY visits DESC))
/* result
┌─URL──┬─visits─┬──%─┬─Accumulate─┐
│ URL2 │ 50 │ 50 │ 50 │
│ URL4 │ 30 │ 30 │ 80 │
│ URL1 │ 10 │ 10 │ 90 │
│ URL5 │ 9 │ 9 │ 99 │
│ URL3 │ 1 │ 1 │ 100 │
└──────┴────────┴────┴────────────┘
*/

Answer 2

Yea! Thanks!!
SELECT
result.1 AS URL,
result.2 AS visits,
round(result.3,
2) AS "%",
round(result.4,
2) AS Accumulate
FROM
(
SELECT
groupArray((URL,
visits)) url_visits,
arraySum(x -> x.2,
url_visits) total_visits,
arrayMap(x -> (100 / total_visits) * x.2,
url_visits) percent_visits,
arrayCumSum(percent_visits) acc_percent_visits,
arrayJoin(arrayMap((x,
y,
z) -> (x.1,
x.2,
y,
z),
url_visits,
percent_visits,
acc_percent_visits)) result
FROM
(
SELECT
URL,
sum(visits) visits
FROM
(/* test data */
SELECT
URL,
visits
FROM
(
select
landing as URL,
visitas as visits
from
Analytics
where
fecha > '2019-05-01'))
GROUP BY
URL
ORDER BY
visits DESC))
This query is more compact:
SELECT
result.1 AS URL,
result.2 AS visits,
round(result.3, 2) AS `%`,
round(result.4, 2) AS Accumulate
FROM
(
SELECT
groupArray((URL, visits)) AS url_visits,
arraySum(x -> (x.2), url_visits) AS total_visits,
arrayMap(x -> ((100 / total_visits) * (x.2)), url_visits) AS percent_visits,
arrayCumSum(percent_visits) AS acc_percent_visits,
arrayJoin(arrayMap((x, y, z) -> (x.1, x.2, y, z), url_visits, percent_visits, acc_percent_visits)) AS result
FROM
(
SELECT
landing AS URL,
sum(visitas) AS visits
FROM Analytics
WHERE fecha > '2019-05-01'
GROUP BY URL
ORDER BY visits DESC
)
)