What does Android feel incomprehensible about SQLite database operations? 2

Today, I used and tested Android's support for the SQLite database. The last time, I felt that the field must have the _ id field, and this field must be the primary key and auto-increment, however, when using the listadapter, it is not necessary to use the _ id field as long as simplecursoradapter is not used to generate an image listadapter adapter, and the work can be completed well. It has been tested today! It may also be a bit out of habit at the beginning. In short, we are getting used to it now! Let's make a record of what we think of today. If you want to communicate, please feel free to email me!