使用如下的SQL语句查询数据库：
SELECT CONCAT (UPPER (SUBSTR (location, 1, 3) ), dept_number) "Department Location"
FROM department;
最后一个求值的函数是哪一个

单项选择题以下的命令中，哪个是SQL*Plus命令

单项选择题客户(CUSTOMER)表包括如下的列： CUSTOMER_D NUMBER(9) LAST_NAME VARCHAR2(20) FIRST_NAME VARCHAR2(20) STREET_ADDRESS VARCHAR2(30) CITY VARCHAR2(20) STATE VARCHAR2(15) POSTAL_CODE VARCHAR2(9) 请问有关下列两个SQL语句的陈述哪一个是正确的 (1)SELECT CONCAT(INITCAP(first_name), INITCAP(last_name)) FROM customer; (2)SELECT INITCAP(first_name)‖INITCAP(last_name) FROM customer;