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Re: Benötige Hilfe bei Erstellung einer Query
Posted by: Peter Brawley
Date: November 16, 2020 12:46PM

Ist es das was du meinst?

drop table if exists tbl;
create table tbl(
  timestamp timestamp,
  device varchar(32),
  type varchar(8),
  event varchar(64),
  reading varchar(32),
  value decimal(8,4),
  unit varchar(8)
);
insert into tbl values
('2020-11-13 19:26:02', 'DatabaseLog', 'DBLOG', 'CacheUsage: 2'                     , 'CacheUsage'                , 2     , ''),
('2020-11-13 19:26:02', 'DatabaseLog', 'DBLOG', 'background_processing_time: 0.0152', 'background_processing_time', 0.0152, ''),
('2020-11-13 19:26:02', 'DatabaseLog', 'DBLOG', 'sql_processing_time: 0.0042'       , 'sql_processing_time'       , 0.0042, ''),
('2020-11-13 19:26:02', 'DbLog'      , 'DBLOG', 'CacheUsage: 145'                   , 'CacheUsage'                , 145   , '');

-- DELETE
delete a 
from tbl a
join tbl b using(timestamp,reading)
where a.device='DatabaseLog' and b.device='DbLog';

select * from tbl;
+---------------------+-------------+-------+------------------------------------+----------------------------+----------+------+
| timestamp           | device      | type  | event                              | reading                    | value    | unit |
+---------------------+-------------+-------+------------------------------------+----------------------------+----------+------+
| 2020-11-13 19:26:02 | DatabaseLog | DBLOG | background_processing_time: 0.0152 | background_processing_time |   0.0152 |      |
| 2020-11-13 19:26:02 | DatabaseLog | DBLOG | sql_processing_time: 0.0042        | sql_processing_time        |   0.0042 |      |
| 2020-11-13 19:26:02 | DbLog       | DBLOG | CacheUsage: 145                    | CacheUsage                 | 145.0000 |      |
+---------------------+-------------+-------+------------------------------------+----------------------------+----------+------+

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Re: Benötige Hilfe bei Erstellung einer Query
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November 16, 2020 12:46PM


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