Sorry if I wasn't clear enough.
What I need is to select companies (activities_bus_busid) who is doing both Fishing and Golf. In our case it is companies 9 and 13
If I use IN operator I'm getting all 3 companies in the result (9,13,10) , as you mention earlier IN is working the same way as OR ( WHERE activities_bus_amid=3 or activities_bus_amid=13)
The simple question is, How to select companies who is doing Fishing and Golf not one of it but both?