Question

I created a new table in SQLite, and named one of the columns as id.

When I access that database at runtime, it generates an error. I found that in my database, I have to use _id instead of id. Why is it necessary for this column to be named as _id?

Answer 1

It’s always a good idea to declare your primary key as:

_id INTEGER PRIMARY KEY AUTOINCREMENT

That way, Android’s functions, which could use the _id to make certain things work for example the id’s in a CursorAdapter.

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For the primary key of the database you should always use the identifier “_id” as some of Android functions rely on this standard.

From this source (direct quote)