data of measurement data of a measurement. Field is age . Target: write a CQs that aggregates the data according to the specified time (group by time ()) logic: count the point of the same age example: count the point of age=14 and age=132 i...
because InfluxDB clusters are charged. Now you are ready to use message queuing to solve the normal data Synchronize of the InfluxDB database cluster. But if a database server goes down, and then restart and start, how to recover the data and turn the da...
use vue as a mobile h5 page project. To achieve a similar full-screen effect, remove the address bar and bottom toolbar of the mobile browser <meta name="browsermode" content="application"> <meta name="full-screen"...
the following sql statement is known: select * from a left join b on a.id=b.id where a.x=1 and b.yroom2; this is a very common join table query in the db layer, but if the db layer does not allow the join table query operation, it can only be queri...
what s the difference between if duplicate is not None: and if not deplicate? -sharp-sharp-sharp topic description ...
by editing a template file such as file.xls, there is a lot of data that needs to be filled in by php, and then other text or tables may have styles, such as red words, large words, table borders, etc. (I have tried to export csv, but feel that this for...
jquery datatable custom sort the first row has no effect, the data is float, like 11.1 22.2 33.3, using the extension method, but after using it, except for the abnormal sorting of the first row, everything else is sorted normally, which is strange . $...