在android中创建表时出现语法错误

private static final String DATABASE_TABLE_TRANS = "Transaction";   
private static final String DATABASE_CREATE_TRANS = 
       "create table " + DATABASE_TABLE_TRANS + "(_id integer primary key autoincrement, "
       + "Amount text not null, " + "Name_of_bank text unique not null, " 
       + "Trans_Time text not null);";

 public void onCreate(SQLiteDatabase db) 
        {
            System.out.println("oncreate of dbbbbbbbbbbbbbbbbb");
            db.execSQL(DATABASE_CREATE_TRANS);
        }
private static final String DATABASE_TABLE_TRAN