thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-26 09:32:01 +00:00
Code Issues Packages Projects Releases Wiki Activity

Improvement for example queries [#METR-20000].

Browse Source
This commit is contained in:
Alexey Milovidov 2016-05-30 04:38:15 +03:00
parent 9b1ad4b454
commit ee537cba0f
1 changed files with 37 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
doc/example_datasets/1_ontime.txt
View File

@ -9,7 +9,7 @@ http://nickmakos.blogspot.ru/2012/08/analyzing-air-traffic-performance-with.html
1. https://github.com/Percona-Lab/ontime-airline-performance/blob/master/download.sh
2.
2.
CREATE TABLE `ontime` (
`Year` UInt16,
@ -123,7 +123,7 @@ CREATE TABLE `ontime` (
`Div5TailNum` String
) ENGINE = MergeTree(FlightDate, (Year, FlightDate), 8192)
3.
3.
for i in *.zip; do echo $i; unzip -cq $i '*.csv' | sed 's/\.00//g' | clickhouse-client --host=example-perftest01j --query="INSERT INTO ontime FORMAT CSVWithNames"; done
@ -143,29 +143,29 @@ Q3. Count of delays per airport for years 2000-2008
SELECT Origin, count(*) AS c FROM ontime WHERE DepDelay>10 AND Year >= 2000 AND Year <= 2008 GROUP BY Origin ORDER BY c DESC LIMIT 10
Q4. Count of delays per Carrier for 2007 year
SELECT Carrier, count(*) FROM ontime WHERE DepDelay>10 AND Year = 2007 GROUP BY Carrier ORDER BY 2 DESC
SELECT Carrier, count(*) FROM ontime WHERE DepDelay>10 AND Year = 2007 GROUP BY Carrier ORDER BY count(*) DESC
Q5. Percentage of delays for each carrier for 2007 year.
SELECT Carrier, c, c2, c*1000/c2 as c3
FROM
FROM
(
SELECT
Carrier,
count(*) AS c
FROM ontime
WHERE DepDelay>10
AND Year=2007
SELECT
Carrier,
count(*) AS c
FROM ontime
WHERE DepDelay>10
AND Year=2007
GROUP BY Carrier
)
ANY INNER JOIN
(
SELECT
Carrier,
count(*) AS c2
FROM ontime
WHERE Year=2007
SELECT
Carrier,
count(*) AS c2
FROM ontime
WHERE Year=2007
GROUP BY Carrier
) USING Carrier
) USING Carrier
ORDER BY c3 DESC;
More optimal version of same query:
@ -174,25 +174,25 @@ SELECT Carrier, avg(DepDelay > 10) * 1000 AS c3 FROM ontime WHERE Year = 2007 GR
Q6. Let’s try the same query for wide range of years 2000-2008.
SELECT Carrier, c, c2, c*1000/c2 as c3
FROM
FROM
(
SELECT
Carrier,
count(*) AS c
FROM ontime
WHERE DepDelay>10
SELECT
Carrier,
count(*) AS c
FROM ontime
WHERE DepDelay>10
AND Year >= 2000 AND Year <= 2008
GROUP BY Carrier
)
ANY INNER JOIN
(
SELECT
Carrier,
count(*) AS c2
FROM ontime
SELECT
Carrier,
count(*) AS c2
FROM ontime
WHERE Year >= 2000 AND Year <= 2008
GROUP BY Carrier
) USING Carrier
) USING Carrier
ORDER BY c3 DESC;
More optimal version of same query:
@ -200,22 +200,22 @@ More optimal version of same query:
SELECT Carrier, avg(DepDelay > 10) * 1000 AS c3 FROM ontime WHERE Year >= 2000 AND Year <= 2008 GROUP BY Carrier ORDER BY Carrier
Q7. Percent of delayed (more 10mins) flights per year.
SELECT Year, c1/c2
SELECT Year, c1/c2
FROM
(
select
Year,
count(*)*1000 as c1
from ontime
WHERE DepDelay>10
select
Year,
count(*)*1000 as c1
from ontime
WHERE DepDelay>10
GROUP BY Year
)
)
ANY INNER JOIN
(
select
select
Year,
count(*) as c2
from ontime
count(*) as c2
from ontime
GROUP BY Year
) USING (Year)
ORDER BY Year