将特定的行从多个表复制到sql中的另一个表

Question

I want to copy a specific row from tables temperature, rules and schedule to stats table.

In temperature table, I want the latest temperature which is 18.6

mysql> SELECT * FROM currenttemp ORDER BY `timestamp` DESC limit 10 ;
+---------------------+-----------------+-------------+----------+----------+
| timestamp           | sensor          | currenttemp | humidity | pressure |
+---------------------+-----------------+-------------+----------+----------+
| 2017-03-25 15:28:03 | sensor-1stFloor |        18.6 |    49.85 |  1021.26 |
| 2017-03-25 15:27:03 | sensor-1stFloor |        18.7 |    49.81 |  1021.26 |
| 2017-03-25 15:26:03 | sensor-1stFloor |        18.8 |    49.82 |  1021.26 |
| 2017-03-25 15:25:03 | sensor-1stFloor |        18.9 |    49.85 |  1021.22 |
| 2017-03-25 15:24:03 | sensor-1stFloor |       18.99 |    49.83 |  1021.21 |
| 2017-03-25 15:23:03 | sensor-1stFloor |       18.61 |    49.85 |  1021.18 |
| 2017-03-25 15:22:02 | sensor-1stFloor |       18.62 |     49.8 |   1021.3 |
| 2017-03-25 15:21:02 | sensor-1stFloor |       18.63 |    49.82 |  1021.39 |
| 2017-03-25 15:20:03 | sensor-1stFloor |       18.61 |    49.82 |  1021.28 |
| 2017-03-25 15:19:03 | sensor-1stFloor |       18.62 |    49.82 |  1021.37 |
+---------------------+-----------------+-------------+----------+----------+

In rules table, I want the targettemp for schedule 4 which is 40

mysql> SELECT * FROM rules limit 10 ;
+----+----------+--------+------------+
| id | schedule | sensor | targettemp |
+----+----------+--------+------------+
|  1 |        4 | 1      |         40 |
|  2 |        5 | 1      |          5 |
+----+----------+--------+------------+

In schedule table, I want the endtime for id 4 which is 10:00:00

mysql> SELECT * FROM schedules limit 10 ;
+----+--------------+-----------+--------------+-----------+----------+---------+------------+--------+
| id | friendlyname | dayofweek | pretimestart | timestart | endtime  | enabled | targettemp | sensor |
+----+--------------+-----------+--------------+-----------+----------+---------+------------+--------+
|  4 | test         | 1111110   | 00:00:00     | 00:00:00  | 10:00:00 |       1 |         30 | 1      |
|  5 | sun          | 0000001   | 00:00:00     | 00:00:00  | 20:00:00 |       0 |          0 |        |
+----+--------------+-----------+--------------+-----------+----------+---------+------------+--------+

I then want to insert these data to the stats table

currenttemp which is 18.6
targettemp for schedule 4 which is 40
endtime for id 4 which is 10:00:00

the timestamp is done automatically
state will be between ON and OFF

please look at the 1st row in stats table as example from the data copied from the above tables.

mysql> SELECT * FROM stats limit 10 ;
+---------------------+-------------+------------+----------+-------+
| timestamp           | currenttemp | targettemp | endtime  | state |
+---------------------+-------------+------------+----------+-------+
| 2017-03-25 15:41:46 |        18.6 |         40 | 10:00:00 | OFF   |
| 2017-03-19 16:53:05 |       16.83 |          5 | 00:00:00 | OFF   |
| 2017-03-19 16:54:14 |       16.83 |         40 | 00:00:00 | ON    |
| 2017-03-19 20:04:07 |       16.58 |         40 | 00:00:00 | ON    |
| 2017-03-19 20:04:15 |       16.58 |          5 | 00:00:00 | OFF   |
| 2017-03-19 20:06:29 |       16.58 |          5 | 00:00:00 | OFF   |
| 2017-03-19 20:34:28 |       16.54 |          5 | 00:00:00 | OFF   |
| 2017-03-19 20:34:56 |       16.54 |          5 | 00:00:00 | OFF   |
| 2017-03-19 20:35:26 |       16.54 |         40 | 00:00:00 | ON    |
| 2017-03-19 20:38:05 |       16.54 |         40 | 00:00:00 | ON    |
+---------------------+-------------+------------+----------+-------+

I will have 2 queries. One with the state OFF and one with the state ON.

Answer 1

Your question is unclear because the relationship between temperature and the other tables is unclear. Let me assume that there is a join key to schedules . If so, the query you want would look something like this:

INSERT INTO stats (currenttemp, targettemp, endtime)
    SELECT t.temperature, r.targettemp, s.timeend
    FROM schedules s INNER JOIN
         rules r
         ON s.id = r.schedule INNER JOIN
         temperature t
         ON t.schedule = s.id
    WHERE s.id = 4 AND
          t.timestamp = (SELECT MAX(t2.timestamp)
                         FROM temperature t2
                         WHERE t2.schedule = t.schedule
                        );

Answer 2

this seems to work

INSERT INTO stats (currenttemp,targettemp,endtime,state)
SELECT 
 temperature,r.targettemp,s.timeend,'OFF'
FROM 
 schedules s
 INNER JOIN rules r 
    ON s.id = r.schedule
 INNER JOIN temperature
 WHERE timestamp = (SELECT MAX(timestamp) FROM temperature)
 AND s.id = 4

i can see now in my stats table

mysql> SELECT * FROM stats limit 10 ;
+---------------------+-------------+------------+----------+-------+
| timestamp           | currenttemp | targettemp | endtime  | state |
+---------------------+-------------+------------+----------+-------+
| 2017-04-06 17:58:05 |       19.53 |         40 | 10:00:00 | OFF   |
+---------------------+-------------+------------+----------+-------+