sql – 查找连续行和计算持续时间

发布时间：2020-12-12 07:27:41 所属栏目：MsSql教程来源：网络整理

导读：我有一组数据告诉我是否有几个系统可用,或者每5或15分钟增量.目前,时间增量无关紧要. 数据如下所示： Status Time System_IDT 10:00 S01T 10:15 S01F 10:30 S01F 10:45 S01F 11:00 S01T 11:15 S01T 11:30 S01F 11:45 S01F 12:00 S01F 12:15 S01T 12:30 S01F 1

我有一组数据告诉我是否有几个系统可用,或者每5或15分钟增量.目前,时间增量无关紧要.

数据如下所示：

Status     Time         System_ID
T          10:00          S01
T          10:15          S01
F          10:30          S01
F          10:45          S01
F          11:00          S01
T          11:15          S01
T          11:30          S01
F          11:45          S01
F          12:00          S01
F          12:15          S01
T          12:30          S01

F          10:00          S02
F          10:15          S02
F          10:30          S02
F          10:45          S02
F          11:00          S02
T          11:15          S02
T          11:30          S02

我想创建一个视图,告诉系统什么时候不可用(即什么时候是F),从什么时间到什么时间,以及从…到的时间.

期望的结果：

System_ID    From            To           Duration
S01          10:30          11:00          00:30 
S01          11:45          12:15          00:30 
S02          10:00          11:00          01:00

这是脚本数据：

DROP SCHEMA IF EXISTS Sys_data CASCADE;
CREATE SCHEMA Sys_data;

CREATE TABLE test_data (
          status BOOLEAN,dTime TIME,sys_ID VARCHAR(10),PRIMARY KEY (dTime,sys_ID)
);

INSERT INTO test_data (status,dTime,sys_ID) VALUES (TRUE,'10:00:00','S01');
INSERT INTO test_data (status,'10:15:00',sys_ID) VALUES (FALSE,'10:30:00','10:45:00','11:00:00','11:15:00','11:30:00','11:45:00','12:00:00','12:15:00','12:30:00','S02');
INSERT INTO test_data (status,'S02');

先感谢您！

解决方法

也许不是最优的,但它的工作原理:)

select sys_id,first_time as down_from,max(dTime) as down_to
from ( select status,sys_id,(select min(td_add2.dTime) 
                from test_data td_add2
               where td_add2.dtime <=  x.dTime
                 and td_add2.dtime >=  COALESCE(x.prev_time,x.min_time)
                 and td_add2.status = x.status       
                 and td_add2.sys_id = x.sys_id ) as first_time
         from ( select td_main.status,td_main.sys_id,td_main.dTime,(select max(td_add.dTime) 
                                   from test_data td_add 
                                  where td_add.dtime <  td_main.dTime
                                    and  td_add.status != td_main.status       
                                    and td_add.sys_id = td_main.sys_id ) as prev_time,(select min(td_add.dTime) 
                                   from test_data td_add 
                                  where td_add.dtime <  td_main.dTime
                                    and td_add.sys_id = td_main.sys_id ) as min_time                                                                                                    
                from test_data td_main) x
      ) y
where status = false 
and first_time is not null 
group by sys_id,first_time
order by sys_id,first_time
+--------+-----------+----------+
| sys_id | down_from | down_to  |
+--------+-----------+----------+
| S01    | 10:30:00  | 11:00:00 |
| S01    | 11:45:00  | 12:15:00 |
| S02    | 10:00:00  | 11:00:00 |
+--------+-----------+----------+
3 rows in set (0.00 sec)

（编辑：李大同）

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