sql - Android AUTOINCREMENT column besides PRIMARY KEY column -

i have table varchar column primary key. furthermore want have autoincremented id each row. column id called "id" not "_id". when try create database, error have syntax error near "autonincrement".

 public static final string sql_create_entries =          "create table " + contactentry.table_name + " (" +          contactentry.column_name_entry_username + " varchar(20) primary key," +          contactentry.column_name_entry_id + " integer autoincrement," +          contactentry.column_name_entry_display_name +           " varchar(25))"; 

please note following : 1. using string primary key not idea in general, since strings not natural cluster indices. 2. autoincemrent possible integer primary key omitted in case