Two of the three tables in his database should have foreign keys that link to primary keys in one of the other tables. That way he can join the tables together.
It might because of many reasons:
- Fan 1 is not connected to the Program (via Bluetooth, WIFI, or wired)
- The code made to make Fan 1 start up has a bug or an error
- Fan 1 has a hardware problem
- Fan 1 is out of reach for the electronically controller to reach
- Fan 1 is not connected to a power supply (tho)
<u><em>sorry if my answers don't help solve your problem </em></u>
Once enough charge has been separated in a growing storm, a lightning flash can occur. These normally travel within or between clouds (abbreviated CC) or from cloud to ground (CG). Most storms produce more CC than CG flashes--about six times as many in tropical storms and two times as many in midlatitudes. Sometimes a flash will travel from cloud to air or simply occur within "clear" air.
Exactly what triggers flashes is still uncertain and an area of continued research. It seems that very concentrated electric fields (perhaps at the ends of pointed surfaces or single particles) are needed to accelerate charged particles, or ions. Once moving with sufficient energy, the ions appear to blaze a path toward opposite charge in cascading fashion.