Sql Oracle时间轴报告来自重叠的时间间隔
我使用的是Oracle 10g,我有一个间隔重叠的表。以简化形式:Sql Oracle时间轴报告来自重叠的时间间隔,sql,oracle,intervals,Sql,Oracle,Intervals,我使用的是Oracle 10g,我有一个间隔重叠的表。以简化形式: create TABLE INTERVAL_TEST ( STARTDATE DATE NOT NULL, ENDDATE DATE, ITEM VARCHAR2(100) NOT NULL ) insert into INTERVAL_TEST (STARTDATE, ENDDATE, ITEM) values (to_date('2012-01-01', 'YYYY-MM-DD'), null, '
create TABLE INTERVAL_TEST (
STARTDATE DATE NOT NULL,
ENDDATE DATE,
ITEM VARCHAR2(100) NOT NULL
)
insert into INTERVAL_TEST (STARTDATE, ENDDATE, ITEM) values (to_date('2012-01-01', 'YYYY-MM-DD'), null, 'AAA');
insert into INTERVAL_TEST (STARTDATE, ENDDATE, ITEM) values (to_date('2012-02-01', 'YYYY-MM-DD'), to_date('2012-03-01', 'YYYY-MM-DD'), 'BBB');
如您所见,存在重叠条目。第一个字段中的null表示该字段永远有效。
我需要生成一个报告,在时间线上显示历史记录,列出每行的有效项目数。输出中不应存在时间重叠,相反,应为没有变化的每个子间隔列出所有有效项:
START END VALID_ITEMS
---------- ---------- --------------
2012-01-01 2012-02-01 AAA
2012-02-01 2012-03-01 AAA, BBB
2012-03-01 NULL AAA
是否存在生成这种结果的SQL语句 你可以用一句话来表达:
SQL> WITH timeline AS
2 (SELECT mydate startdate,
3 lead(mydate) OVER (ORDER BY mydate) - 1 enddate
4 FROM (SELECT startdate mydate FROM interval_test
5 UNION
6 SELECT enddate FROM interval_test)
7 WHERE mydate IS NOT NULL)
8 SELECT startdate,
9 enddate,
10 max(substr(sys_connect_by_path(item, ','), 2)) items
11 FROM (SELECT t.startdate,
12 t.enddate,
13 item,
14 row_number() OVER (PARTITION BY t.startdate, t.enddate
15 ORDER BY i.item) rn
16 FROM timeline t
17 JOIN
18 interval_test i
19 ON nvl(i.enddate, DATE '9999-12-31') - 1 >= t.startdate
20 AND i.startdate <= nvl(t.enddate, DATE '9999-12-31'))
21 START WITH rn = 1
22 CONNECT BY rn = PRIOR rn + 1
23 AND startdate = PRIOR startdate
24 GROUP BY startdate, enddate
25 ORDER BY startdate;
STARTDATE ENDDATE ITEMS
---------- ---------- --------------------
2012-01-01 2012-01-31 AAA
2012-02-01 2012-02-29 AAA,BBB
2012-03-01 AAA
已加入以下查询,该查询列出给定两个日期的一行中的所有项目:
SELECT max(substr(sys_connect_by_path(item, ','), 2)) items
FROM (SELECT item, row_number() OVER (ORDER BY item) rn
FROM interval_test
WHERE nvl(enddate, DATE '9999-12-31') >= :startdate
AND startdate <= :enddate)
CONNECT BY rn = PRIOR rn + 1
START WITH rn = 1;
它在更复杂的情况下也能很好地工作,我印象深刻:谢谢!Vincent Malgrat的解决方案是一种保证;-:-
SELECT max(substr(sys_connect_by_path(item, ','), 2)) items
FROM (SELECT item, row_number() OVER (ORDER BY item) rn
FROM interval_test
WHERE nvl(enddate, DATE '9999-12-31') >= :startdate
AND startdate <= :enddate)
CONNECT BY rn = PRIOR rn + 1
START WITH rn = 1;