我还没有得到答案,例如,应该如何聚合一连串的多行,其中每一行都比前一行早不到一分钟,例如
SELECT 1, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:12' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:15' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:30' HOUR TO SECOND FROM DUAL
由于您已经有一个将所有这些值聚合到一个组中的解决方案(即 10:01:30-10:00:12 > 1 分钟,但它们仍然在同一个组中),我将展示如何获取第一次和最后一次销售之间的最大差异
在这种情况下,最好使用带有range between current row and interval '1' minute following 的分析函数。例如,对于每笔销售,我们可以很容易地得到下一分钟在同一地点有多少销售:
with CAR_SALES ( NUM_CARS, EQUIPMENT_TYPE, LOCATION, SOLD_DATE ) AS (
SELECT 1, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:12' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:15' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:30' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 9, 'Jaguars', 'coventry', DATE '2019-09-07' + INTERVAL '06:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 7, 'Rovers', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:13' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 10, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '09:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:48' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 8, 'Rovers', 'coventry', DATE '2019-09-06' + INTERVAL '18:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 4, 'Rovers', 'leamington', DATE '2019-09-06' + INTERVAL '09:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 100, 'Trans Am', 'leamington', DATE '2019-09-06' + INTERVAL '08:59:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 1, 'corvette', 'leamington', DATE '2019-09-06' + INTERVAL '09:00:10' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Toyota', 'coventry', DATE '2019-09-06' + INTERVAL '10:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 15, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '11:05:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Jaguars', 'coventry', DATE '2019-09-07' + INTERVAL '17:02:07' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:25' HOUR TO SECOND FROM DUAL
)
SELECT
location,
num_cars,
equipment_type,
sold_date,
count(*)over(partition by LOCATION order by SOLD_DATE range between current row and interval'1' minute following) cnt
from car_sales
order by location,sold_date;
我添加了一些额外的行,以便更容易看到差异。
结果:
LOCATION NUM_CARS EQUIPMEN SOLD_DATE CNT
---------- ---------- -------- ------------------- ----------
coventry 2 Toyota 2019-09-06 10:00:00 1
coventry 8 Rovers 2019-09-06 18:00:00 1
coventry 9 Jaguars 2019-09-07 06:00:00 1
coventry 1 Rovers 2019-09-07 10:00:12 2
coventry 2 Rovers 2019-09-07 10:00:45 3
coventry 3 Rovers 2019-09-07 10:01:15 2
coventry 3 Rovers 2019-09-07 10:01:30 1
coventry 15 Rovers 2019-09-07 11:05:00 1
coventry 2 Jaguars 2019-09-07 17:02:07 1
leamington 10 Trans Am 2019-08-30 09:00:00 1
leamington 7 Rovers 2019-08-30 13:10:13 3
leamington 3 Trans Am 2019-08-30 13:10:25 2
leamington 2 Trans Am 2019-08-30 13:10:48 1
leamington 100 Trans Am 2019-09-06 08:59:45 3
leamington 4 Rovers 2019-09-06 09:00:00 2
leamington 1 corvette 2019-09-06 09:00:10 1
16 rows selected.
此外,我们还可以轻松检查前面的行并仅过滤那些具有 cnt_preceding>1 或 cnt_following>1 的行,即具有相邻
select *
from (
SELECT
location,
num_cars,
equipment_type,
sold_date,
count(*)over(partition by LOCATION order by SOLD_DATE range between interval'1' minute preceding and current row) cnt_preceding,
count(*)over(partition by LOCATION order by SOLD_DATE range between current row and interval'1' minute following) cnt_following
from car_sales
)
where
cnt_preceding > 1
or cnt_following > 1
order by location, sold_date;
结果:https://dbfiddle.uk/?rdbms=oracle_18&fiddle=000865dd639ab8d6d6e9fbf64100fcf0
LOCATION NUM_CARS EQUIPMEN SOLD_DATE CNT_PRECEDING CNT_FOLLOWING
---------- ---------- -------- ------------------- ------------- -------------
coventry 1 Rovers 2019-09-07 10:00:12 1 2
coventry 2 Rovers 2019-09-07 10:00:45 2 3
coventry 3 Rovers 2019-09-07 10:01:15 2 2
coventry 3 Rovers 2019-09-07 10:01:30 3 1
leamington 7 Rovers 2019-08-30 13:10:13 1 3
leamington 3 Trans Am 2019-08-30 13:10:25 2 2
leamington 2 Trans Am 2019-08-30 13:10:48 3 1
leamington 100 Trans Am 2019-09-06 08:59:45 1 3
leamington 4 Rovers 2019-09-06 09:00:00 2 2
leamington 1 corvette 2019-09-06 09:00:10 3 1
所以我们现在唯一需要的是通过非重叠间隔
with CAR_SALES ( NUM_CARS, EQUIPMENT_TYPE, LOCATION, SOLD_DATE ) AS (
SELECT 1, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:12' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:15' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:30' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 9, 'Jaguars', 'coventry', DATE '2019-09-07' + INTERVAL '06:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 7, 'Rovers', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:13' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 10, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '09:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:48' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 8, 'Rovers', 'coventry', DATE '2019-09-06' + INTERVAL '18:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 4, 'Rovers', 'leamington', DATE '2019-09-06' + INTERVAL '09:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 100, 'Trans Am', 'leamington', DATE '2019-09-06' + INTERVAL '08:59:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 1, 'corvette', 'leamington', DATE '2019-09-06' + INTERVAL '09:00:10' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Toyota', 'coventry', DATE '2019-09-06' + INTERVAL '10:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 15, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '11:05:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Jaguars', 'coventry', DATE '2019-09-07' + INTERVAL '17:02:07' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:25' HOUR TO SECOND FROM DUAL
)
select *
from car_sales
match_recognize (
partition by location
order by sold_date
MEASURES
FIRST(A.SOLD_DATE) dt_strt,
LAST(SOLD_DATE) dt_end,
MATCH_NUMBER() AS mno,
CLASSIFIER() AS cls
ALL ROWS PER MATCH
PATTERN (A B+)
DEFINE
B AS B.sold_date < first(A.sold_date) + interval '1' minute
)
order by location, sold_date
;
结果:
LOCATION SOLD_DATE DT_STRT DT_END MNO CLS NUM_CARS EQUIPMEN
---------- ------------------- ------------------- ------------------- ---------- ----- ---------- --------
coventry 2019-09-07 10:00:12 2019-09-07 10:00:12 2019-09-07 10:00:12 1 A 1 Rovers
coventry 2019-09-07 10:00:45 2019-09-07 10:00:12 2019-09-07 10:00:45 1 B 2 Rovers
coventry 2019-09-07 10:01:15 2019-09-07 10:01:15 2019-09-07 10:01:15 2 A 3 Rovers
coventry 2019-09-07 10:01:30 2019-09-07 10:01:15 2019-09-07 10:01:30 2 B 3 Rovers
leamington 2019-08-30 13:10:13 2019-08-30 13:10:13 2019-08-30 13:10:13 1 A 7 Rovers
leamington 2019-08-30 13:10:25 2019-08-30 13:10:13 2019-08-30 13:10:25 1 B 3 Trans Am
leamington 2019-08-30 13:10:48 2019-08-30 13:10:13 2019-08-30 13:10:48 1 B 2 Trans Am
leamington 2019-09-06 08:59:45 2019-09-06 08:59:45 2019-09-06 08:59:45 2 A 100 Trans Am
leamington 2019-09-06 09:00:00 2019-09-06 08:59:45 2019-09-06 09:00:00 2 B 4 Rovers
leamington 2019-09-06 09:00:10 2019-09-06 08:59:45 2019-09-06 09:00:10 2 B 1 corvette
10 rows selected.
如您所见,MNO 返回 MATCH_NUMBER(),即该位置的组数,所以现在我们可以轻松地聚合这些组:
with CAR_SALES ( NUM_CARS, EQUIPMENT_TYPE, LOCATION, SOLD_DATE ) AS (
SELECT 1, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:12' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:00:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:15' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '10:01:30' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 9, 'Jaguars', 'coventry', DATE '2019-09-07' + INTERVAL '06:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 7, 'Rovers', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:13' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 10, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '09:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:48' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 8, 'Rovers', 'coventry', DATE '2019-09-06' + INTERVAL '18:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 4, 'Rovers', 'leamington', DATE '2019-09-06' + INTERVAL '09:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 100, 'Trans Am', 'leamington', DATE '2019-09-06' + INTERVAL '08:59:45' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 1, 'corvette', 'leamington', DATE '2019-09-06' + INTERVAL '09:00:10' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Toyota', 'coventry', DATE '2019-09-06' + INTERVAL '10:00:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 15, 'Rovers', 'coventry', DATE '2019-09-07' + INTERVAL '11:05:00' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 2, 'Jaguars', 'coventry', DATE '2019-09-07' + INTERVAL '17:02:07' HOUR TO SECOND FROM DUAL UNION ALL
SELECT 3, 'Trans Am', 'leamington', DATE '2019-08-30' + INTERVAL '13:10:25' HOUR TO SECOND FROM DUAL
)
,matches as (
select *
from car_sales
match_recognize (
partition by location
order by sold_date
MEASURES
FIRST(A.SOLD_DATE) dt_strt,
LAST(SOLD_DATE) dt_end,
MATCH_NUMBER() AS mno,
CLASSIFIER() AS cls
ALL ROWS PER MATCH
PATTERN (A B+)
DEFINE
B AS B.sold_date < first(A.sold_date) + interval '1' minute
)
)
select
location,
mno,
dt_strt,
listagg(EQUIPMENT_TYPE,',')
within group(order by sold_date) EQUIPMENT_TYPEs,
listagg(to_char(sold_date,'hh24:mi:ss'),',')
within group(order by sold_date) sold_dates
from matches
group by
location,
mno,
dt_strt
order by 1,2
;
带有结果的完整测试用例:https://dbfiddle.uk/?rdbms=oracle_18&fiddle=d2594a250f9adb5a9f290d7f72be2e05
LOCATION MNO DT_STRT EQUIPMENT_TYPES SOLD_DATES
---------- ---------- ------------------- ---------------------------------------- --------------------------------------------------
coventry 1 2019-09-07 10:00:12 Rovers,Rovers 10:00:12,10:00:45
coventry 2 2019-09-07 10:01:15 Rovers,Rovers 10:01:15,10:01:30
leamington 1 2019-08-30 13:10:13 Rovers,Trans Am,Trans Am 13:10:13,13:10:25,13:10:48
leamington 2 2019-09-06 08:59:45 Trans Am,Rovers,corvette 08:59:45,09:00:00,09:00:10