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DOCAPI-6423: simpleLinearRegression function docs (#5484)

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BayoNet 2019-06-17 12:06:08 +03:00 committed by Ivan Blinkov
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117
docs/en/getting_started/example_datasets/ontime.md
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@ -163,31 +163,54 @@ clickhouse-client --query "select count(*) from datasets.ontime"
Q0.
``` sql
select avg(c1) from (select Year, Month, count(*) as c1 from ontime group by Year, Month);
SELECT avg(c1)
FROM
(
SELECT Year, Month, count(*) AS c1
FROM ontime
GROUP BY Year, Month
);
```
Q1. The number of flights per day from the year 2000 to 2008
``` sql
SELECT DayOfWeek, count(*) AS c FROM ontime WHERE Year >= 2000 AND Year <= 2008 GROUP BY DayOfWeek ORDER BY c DESC;
SELECT DayOfWeek, count(*) AS c
FROM ontime
WHERE Year>=2000 AND Year<=2008
GROUP BY DayOfWeek
ORDER BY c DESC;
```
Q2. The number of flights delayed by more than 10 minutes, grouped by the day of the week, for 2000-2008
``` sql
SELECT DayOfWeek, count(*) AS c FROM ontime WHERE DepDelay>10 AND Year >= 2000 AND Year <= 2008 GROUP BY DayOfWeek ORDER BY c DESC
SELECT DayOfWeek, count(*) AS c
FROM ontime
WHERE DepDelay>10 AND Year>=2000 AND Year<=2008
GROUP BY DayOfWeek
ORDER BY c DESC;
```
Q3. The number of delays by airport for 2000-2008
``` sql
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
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. The number of delays by carrier for 2007
``` sql
SELECT Carrier, count(*) FROM ontime WHERE DepDelay>10 AND Year = 2007 GROUP BY Carrier ORDER BY count(*) DESC
SELECT Carrier, count(*)
FROM ontime
WHERE DepDelay>10 AND Year=2007
GROUP BY Carrier
ORDER BY count(*) DESC;
```
Q5. The percentage of delays by carrier for 2007
@ -219,7 +242,11 @@ ORDER BY c3 DESC;
Better version of the same query:
``` sql
SELECT Carrier, avg(DepDelay > 10) * 100 AS c3 FROM ontime WHERE Year = 2007 GROUP BY Carrier ORDER BY Carrier
SELECT Carrier, avg(DepDelay>10)*100 AS c3
FROM ontime
WHERE Year=2007
GROUP BY Carrier
ORDER BY Carrier
```
Q6. The previous request for a broader range of years, 2000-2008
@ -233,7 +260,7 @@ FROM
count(*) AS c
FROM ontime
WHERE DepDelay>10
AND Year >= 2000 AND Year <= 2008
AND Year>=2000 AND Year<=2008
GROUP BY Carrier
)
ANY INNER JOIN
@ -242,7 +269,7 @@ ANY INNER JOIN
Carrier,
count(*) AS c2
FROM ontime
WHERE Year >= 2000 AND Year <= 2008
WHERE Year>=2000 AND Year<=2008
GROUP BY Carrier
) USING Carrier
ORDER BY c3 DESC;
@ -251,7 +278,11 @@ ORDER BY c3 DESC;
Better version of the same query:
``` sql
SELECT Carrier, avg(DepDelay > 10) * 100 AS c3 FROM ontime WHERE Year >= 2000 AND Year <= 2008 GROUP BY Carrier ORDER BY Carrier
SELECT Carrier, avg(DepDelay>10)*100 AS c3
FROM ontime
WHERE Year>=2000 AND Year<=2008
GROUP BY Carrier
ORDER BY Carrier;
```
Q7. Percentage of flights delayed for more than 10 minutes, by year
@ -275,41 +306,51 @@ ANY INNER JOIN
from ontime
GROUP BY Year
) USING (Year)
ORDER BY Year
ORDER BY Year;
```
Better version of the same query:
``` sql
SELECT Year, avg(DepDelay > 10) FROM ontime GROUP BY Year ORDER BY Year
SELECT Year, avg(DepDelay>10)
FROM ontime
GROUP BY Year
ORDER BY Year;
```
Q8. The most popular destinations by the number of directly connected cities for various year ranges
``` sql
SELECT DestCityName, uniqExact(OriginCityName) AS u FROM ontime WHERE Year >= 2000 and Year <= 2010 GROUP BY DestCityName ORDER BY u DESC LIMIT 10;
SELECT DestCityName, uniqExact(OriginCityName) AS u F
ROM ontime
WHERE Year>=2000 and Year<=2010
GROUP BY DestCityName
ORDER BY u DESC
LIMIT 10;
```
Q9.
``` sql
select Year, count(*) as c1 from ontime group by Year;
SELECT Year, count(*) AS c1
FROM ontime
GROUP BY Year;
```
Q10.
``` sql
select
min(Year), max(Year), Carrier, count(*) as cnt,
sum(ArrDelayMinutes>30) as flights_delayed,
round(sum(ArrDelayMinutes>30)/count(*),2) as rate
SELECT
min(Year), max(Year), Carrier, count(*) AS cnt,
sum(ArrDelayMinutes>30) AS flights_delayed,
round(sum(ArrDelayMinutes>30)/count(*),2) AS rate
FROM ontime
WHERE
DayOfWeek not in (6,7) and OriginState not in ('AK', 'HI', 'PR', 'VI')
and DestState not in ('AK', 'HI', 'PR', 'VI')
and FlightDate < '2010-01-01'
DayOfWeek NOT IN (6,7) AND OriginState NOT IN ('AK', 'HI', 'PR', 'VI')
AND DestState NOT IN ('AK', 'HI', 'PR', 'VI')
AND FlightDate < '2010-01-01'
GROUP by Carrier
HAVING cnt > 100000 and max(Year) > 1990
HAVING cnt>100000 and max(Year)>1990
ORDER by rate DESC
LIMIT 1000;
```
@ -317,15 +358,39 @@ LIMIT 1000;
Bonus:
``` sql
SELECT avg(cnt) FROM (SELECT Year,Month,count(*) AS cnt FROM ontime WHERE DepDel15=1 GROUP BY Year,Month)
SELECT avg(cnt)
FROM
(
SELECT Year,Month,count(*) AS cnt
FROM ontime
WHERE DepDel15=1
GROUP BY Year,Month
);
select avg(c1) from (select Year,Month,count(*) as c1 from ontime group by Year,Month)
SELECT avg(c1) FROM
(
SELECT Year,Month,count(*) AS c1
FROM ontime
GROUP BY Year,Month
);
SELECT DestCityName, uniqExact(OriginCityName) AS u FROM ontime GROUP BY DestCityName ORDER BY u DESC LIMIT 10;
SELECT DestCityName, uniqExact(OriginCityName) AS u
FROM ontime
GROUP BY DestCityName
ORDER BY u DESC
LIMIT 10;
SELECT OriginCityName, DestCityName, count() AS c FROM ontime GROUP BY OriginCityName, DestCityName ORDER BY c DESC LIMIT 10;
SELECT OriginCityName, DestCityName, count() AS c
FROM ontime
GROUP BY OriginCityName, DestCityName
ORDER BY c DESC
LIMIT 10;
SELECT OriginCityName, count() AS c FROM ontime GROUP BY OriginCityName ORDER BY c DESC LIMIT 10;
SELECT OriginCityName, count() AS c
FROM ontime
GROUP BY OriginCityName
ORDER BY c DESC
LIMIT 10;
```
This performance test was created by Vadim Tkachenko. See:

6
docs/en/query_language/agg_functions/reference.md
View File

@ -839,12 +839,12 @@ simpleLinearRegression(x, y)
Parameters:
- `x` — Column with values of dependent variable.
- `y` — Column with explanatory variable.
- `x` — Column with dependent variable values.
- `y` — Column with explanatory variable values.
Returned values:
Parameters `(a, b)` of the resulting line `y = a*x + b`.
Constants `(a, b)` of the resulting line `y = a*x + b`.
**Examples**

117
docs/ru/getting_started/example_datasets/ontime.md
View File

@ -163,31 +163,54 @@ clickhouse-client --query "SELECT COUNT(*) FROM datasets.ontime"
Q0.
``` sql
select avg(c1) from (select Year, Month, count(*) as c1 from ontime group by Year, Month);
SELECT avg(c1)
FROM
(
SELECT Year, Month, count(*) AS c1
FROM ontime
GROUP BY Year, Month
);
```
Q1. Количество полетов в день с 2000 по 2008 года
``` sql
SELECT DayOfWeek, count(*) AS c FROM ontime WHERE Year >= 2000 AND Year <= 2008 GROUP BY DayOfWeek ORDER BY c DESC;
SELECT DayOfWeek, count(*) AS c
FROM ontime
WHERE Year>=2000 AND Year<=2008
GROUP BY DayOfWeek
ORDER BY c DESC;
```
Q2. Количество полетов, задержанных более чем на 10 минут, с группировкой по дням неделе, за 2000-2008 года
``` sql
SELECT DayOfWeek, count(*) AS c FROM ontime WHERE DepDelay>10 AND Year >= 2000 AND Year <= 2008 GROUP BY DayOfWeek ORDER BY c DESC
SELECT DayOfWeek, count(*) AS c
FROM ontime
WHERE DepDelay>10 AND Year>=2000 AND Year<=2008
GROUP BY DayOfWeek
ORDER BY c DESC;
```
Q3. Количество задержек по аэропортам за 2000-2008
``` sql
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
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. Количество задержек по перевозчикам за 2007 год
``` sql
SELECT Carrier, count(*) FROM ontime WHERE DepDelay>10 AND Year = 2007 GROUP BY Carrier ORDER BY count(*) DESC
SELECT Carrier, count(*)
FROM ontime
WHERE DepDelay>10 AND Year=2007
GROUP BY Carrier
ORDER BY count(*) DESC;
```
Q5. Процент задержек по перевозчикам за 2007 год
@ -219,7 +242,11 @@ ORDER BY c3 DESC;
Более оптимальная версия того же запроса:
``` sql
SELECT Carrier, avg(DepDelay > 10) * 100 AS c3 FROM ontime WHERE Year = 2007 GROUP BY Carrier ORDER BY Carrier
SELECT Carrier, avg(DepDelay>10)*100 AS c3
FROM ontime
WHERE Year=2007
GROUP BY Carrier
ORDER BY Carrier
```
Q6. Предыдущий запрос за более широкий диапазон лет, 2000-2008
@ -233,7 +260,7 @@ FROM
count(*) AS c
FROM ontime
WHERE DepDelay>10
AND Year >= 2000 AND Year <= 2008
AND Year>=2000 AND Year<=2008
GROUP BY Carrier
)
ANY INNER JOIN
@ -242,7 +269,7 @@ ANY INNER JOIN
Carrier,
count(*) AS c2
FROM ontime
WHERE Year >= 2000 AND Year <= 2008
WHERE Year>=2000 AND Year<=2008
GROUP BY Carrier
) USING Carrier
ORDER BY c3 DESC;
@ -251,7 +278,11 @@ ORDER BY c3 DESC;
Более оптимальная версия того же запроса:
``` sql
SELECT Carrier, avg(DepDelay > 10) * 100 AS c3 FROM ontime WHERE Year >= 2000 AND Year <= 2008 GROUP BY Carrier ORDER BY Carrier
SELECT Carrier, avg(DepDelay>10)*100 AS c3
FROM ontime
WHERE Year>=2000 AND Year<=2008
GROUP BY Carrier
ORDER BY Carrier;
```
Q7. Процент полетов, задержанных на более 10 минут, в разбивке по годам
@ -275,41 +306,51 @@ ANY INNER JOIN
from ontime
GROUP BY Year
) USING (Year)
ORDER BY Year
ORDER BY Year;
```
Более оптимальная версия того же запроса:
``` sql
SELECT Year, avg(DepDelay > 10) FROM ontime GROUP BY Year ORDER BY Year
SELECT Year, avg(DepDelay>10)
FROM ontime
GROUP BY Year
ORDER BY Year;
```
Q8. Самые популярные направления по количеству напрямую соединенных городов для различных диапазонов лет
``` sql
SELECT DestCityName, uniqExact(OriginCityName) AS u FROM ontime WHERE Year >= 2000 and Year <= 2010 GROUP BY DestCityName ORDER BY u DESC LIMIT 10;
SELECT DestCityName, uniqExact(OriginCityName) AS u F
ROM ontime
WHERE Year>=2000 and Year<=2010
GROUP BY DestCityName
ORDER BY u DESC
LIMIT 10;
```
Q9.
``` sql
select Year, count(*) as c1 from ontime group by Year;
SELECT Year, count(*) AS c1
FROM ontime
GROUP BY Year;
```
Q10.
``` sql
select
min(Year), max(Year), Carrier, count(*) as cnt,
sum(ArrDelayMinutes>30) as flights_delayed,
round(sum(ArrDelayMinutes>30)/count(*),2) as rate
SELECT
min(Year), max(Year), Carrier, count(*) AS cnt,
sum(ArrDelayMinutes>30) AS flights_delayed,
round(sum(ArrDelayMinutes>30)/count(*),2) AS rate
FROM ontime
WHERE
DayOfWeek not in (6,7) and OriginState not in ('AK', 'HI', 'PR', 'VI')
and DestState not in ('AK', 'HI', 'PR', 'VI')
and FlightDate < '2010-01-01'
DayOfWeek NOT IN (6,7) AND OriginState NOT IN ('AK', 'HI', 'PR', 'VI')
AND DestState NOT IN ('AK', 'HI', 'PR', 'VI')
AND FlightDate < '2010-01-01'
GROUP by Carrier
HAVING cnt > 100000 and max(Year) > 1990
HAVING cnt>100000 and max(Year)>1990
ORDER by rate DESC
LIMIT 1000;
```
@ -317,15 +358,39 @@ LIMIT 1000;
Бонус:
``` sql
SELECT avg(cnt) FROM (SELECT Year,Month,count(*) AS cnt FROM ontime WHERE DepDel15=1 GROUP BY Year,Month)
SELECT avg(cnt)
FROM
(
SELECT Year,Month,count(*) AS cnt
FROM ontime
WHERE DepDel15=1
GROUP BY Year,Month
);
select avg(c1) from (select Year,Month,count(*) as c1 from ontime group by Year,Month)
SELECT avg(c1) FROM
(
SELECT Year,Month,count(*) AS c1
FROM ontime
GROUP BY Year,Month
);
SELECT DestCityName, uniqExact(OriginCityName) AS u FROM ontime GROUP BY DestCityName ORDER BY u DESC LIMIT 10;
SELECT DestCityName, uniqExact(OriginCityName) AS u
FROM ontime
GROUP BY DestCityName
ORDER BY u DESC
LIMIT 10;
SELECT OriginCityName, DestCityName, count() AS c FROM ontime GROUP BY OriginCityName, DestCityName ORDER BY c DESC LIMIT 10;
SELECT OriginCityName, DestCityName, count() AS c
FROM ontime
GROUP BY OriginCityName, DestCityName
ORDER BY c DESC
LIMIT 10;
SELECT OriginCityName, count() AS c FROM ontime GROUP BY OriginCityName ORDER BY c DESC LIMIT 10;
SELECT OriginCityName, count() AS c
FROM ontime
GROUP BY OriginCityName
ORDER BY c DESC
LIMIT 10;
```
Данный тест производительности был создан Вадимом Ткаченко, статьи по теме:

4
docs/ru/query_language/agg_functions/reference.md
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@ -597,12 +597,12 @@ simpleLinearRegression(x, y)
Параметры:
- `x` — Столбец со значениями зависимой переменной.
- `x` — столбец со значениями зависимой переменной.
- `y` — столбец со значениями наблюдаемой переменной.
Возвращаемые значения:
Параметры `(a, b)` результирующей прямой `x = a*y + b`.
Константы `(a, b)` результирующей прямой `y = a*x + b`.
**Примеры**