Question

We could insert data into database without using the Uri. But when we are using contentResolver we need the Uri to do anything.

Like getContentResolver().insert(CONTENT_URI, values); But in Database query execution we do not need any Uri. Like db.execSQL(String query);. Why is this?

Answer 1

While I think this question is about to be closed, I think what you are asking is why when you use a content resolver you have to use a CONTENT_URI, but when using a database you dont?

Content Provider

This is because Content Resolvers provide more functionality than just a database

Content providers store and retrieve data and make it accessible to
all applications. They’re the only way to share data across
applications; there’s no common storage area that all Android packages
can access.

Android ships with a number of content providers for common data types
(audio, video, images, personal contact information, and so on). You
can see some of them listed in the android.provider package. You can
query these providers for the data they contain (although, for some,
you must acquire the proper permission to read the data).

When a query is initiated, the Android system identifies the content
provider that’s the target of the query and makes sure that it is up
and running.

Database

With a database, it is not accessible from ANY application via a Content Provider (unless you write one). Using db.execSQL, you are only querying your database and not a content provider, thus you don’t need to provide a CONTENT_URI. Your db object IS the data store.