查看此SQL语句，选择三个正确答案确认可以使查询成功执行的ORDER BY子句。

查看此SQL语句，选择三个正确答案确认可以使查询成功执行的ORDER BY子句。SELECT cust_id, cus_last_name "Last Name" FROM customers WHERE country_id = 10 UNION SELECT cust_id CUST_NO, cust_last_name FROM customers WHERE country_id = 30

A、ORDER BY 2, 1

B、ORDER BY 2,cust_id

C、ORDER BY "CUST_NO"

D、ORDER BY CUST_NO

E、ORDER BY "Last Name"

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