How to in Room Database delete two tables in one query?

Question

How to in Room delete two tables in one Query? I've tried this, but it doesn't work. Room does not allow the use of such a query.

@Query("DELETE (DELETE FROM expense_table) AND (DELETE FROM income_table)")
void deleteAllData();

Answer 1

You could use transaction https://developer.android.com/reference/androidx/room/Transaction

@Transaction
 public void deleteTwo(TableEx table, TableIn table_in) {
     // Anything inside this method runs in a single transaction.
     delete(table);
     delete(table_in);
 }