各クライアントの実行が連続した月次実行に基づいて要約されるデータベースを作成しようとしています。以下のコードは、次のようなテーブルを構築します。
drop table RUNNING_LOG;
create table running_log (
run_date date not null,
time_in_seconds int not null,
distance_in_miles int not null,
SERV_YRMO VARCHAR2(6)
)
begin
insert into running_log values (date'2018-01-01', 420, 1,'201801');
insert into running_log values (date'2018-01-02', 2400, 5,'201801');
insert into running_log values (date'2018-01-03', 2430, 5,'201801');
insert into running_log values (date'2018-01-06', 2350, 5,'201801');
insert into running_log values (date'2018-02-07', 410, 1,'201802');
insert into running_log values (date'2018-02-10', 400, 1,'201802');
insert into running_log values (date'2018-02-13', 2300, 5,'201802');
insert into running_log values (date'2018-03-14', 425, 1,'201803');
insert into running_log values (date'2018-03-15', 422, 1,'201803');
commit;
end;
select * from running_log
最終結果は次のようになることを望みます:
連続した月を取得し、区切りがある単一の行に分割し、複数のクライアントにグループ化するにはどうすればよいでしょうか?
with grps as (
select run_date
, row_number() over (order by run_date) rn ,
run_date - row_number() over (order by run_date) grp_date
from running_log
)
select min(run_date) first_run, max(run_date) last_run,
count(*) runs,
row_number() over (order by min(run_date)) grp
from grps
group by grp_date
order by min(run_date)
答え1
合計コードを投稿していただけますか?
はい。
詳細なコードをステップごとに公開します。ご要望があれば、いくつかの個別のステップを組み合わせて削減することもできます。
WITH
-- calculating data period borders
cte1 (mindate, maxdate)
AS ( SELECT ROUND(MIN(run_date), 'MONTH'),
ROUND(MAX(run_date), 'MONTH')
FROM running_log ),
-- generating months list
cte2 (run_month)
AS ( SELECT mindate
FROM cte1
UNION ALL
SELECT ADD_MONTHS(cte2.run_month, 1)
FROM cte1, cte2
WHERE cte2.run_month < cte1.maxdate ),
-- marking empty months
cte3 (run_month, isempty)
AS ( SELECT cte2.run_month, CASE WHEN 0 = COUNT(running_log.run_date)
THEN 1
ELSE 0 END
FROM cte2
LEFT JOIN running_log
ON ROUND(running_log.run_date, 'MONTH') = cte2.run_month
GROUP BY cte2.run_month ),
-- calculating group numbers for months
cte4 (run_month, group_num)
AS ( SELECT run_month, SUM(isempty) OVER (ORDER BY run_month ASC)
FROM cte3 ),
-- assigning group numbers to separate records
cte5 (run_date, time_in_seconds, distance_in_miles, SERV_YRMO, group_num)
AS ( SELECT running_log.run_date, running_log.time_in_seconds, running_log.distance_in_miles, running_log.SERV_YRMO, cte4.group_num
FROM cte4
LEFT JOIN running_log
ON ROUND(running_log.run_date, 'MONTH') = cte4.run_month )
-- obtaining desured output
SELECT MIN(SERV_YRMO) "Min", MAX(SERV_YRMO) "Max", SUM(distance_in_miles) Runs, SUM(time_in_seconds) Seconds
FROM cte5
GROUP BY group_num
ORDER BY group_num