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1. You would like to display the system date in the format "Monday, 01 June, 2001".
Which SELECT statement should you use?

A) SELECT TO_CHAR(SYSDATE, 'FMDD, DY Month, 'YYYY') FROM dual;
B) SELECT TO_CHAR(SYSDATE, 'FMDY, DDD Month, YYYY') FROM dual;
C) SELECT TO_DATE(SYSDATE, 'FMDAY, DD Month, YYYY') FROM dual;
D) SELECT TO_DATE(SYSDATE, 'FMDY, DDD Month, YYYY') FROM dual;
E) SELECT TO_CHAR(SYSDATE, 'FMDay, DD Month, YYYY') FROM dual;

2. Examine the structure of the EMPLOYEES, DEPARTMENTS, and TAX tables.

For which situation would you use a nonequijoin query?

A) To list the name, job id, and manager name for all the employees.
B) To find the tax percentage for each of the employees.
C) To find the number of employees working for the Administrative department and earning less then 4000.
D) To find the name, salary, and department name of employees who are not working with Smith.
E) To display name, salary, manager ID, and department name of all the employees, even if the employees do not have a department ID assigned.

3. Examine the data in the EMPLOYEES and DEPARTMENTS tables.

You want to retrieve all employees, whether or not they have matching departments in the departments table. Which query would you use?

A) SELECT last_name, department_name FROM employees e LEFT OUTER JOIN departments d ON (e.department_id = d.department_id);
B) SELECT last_name, department_name FROM employees e RIGHT OUTER JOIN departments d ON (e.department_id = d.department_id);
C) SELECT last_name, department_name FROM employees , departments(+);
D) SELECT last_name, department_name FROM employees(+) e JOIN departments d ON (e.department_id = d.department_id);
E) SELECT last_name, department_name FROM employees(+) , departments ON (e.department_id = d.department_id);
F) SELECT last_name, department_name FROM employees JOIN departments (+);

4. In which scenario would TOP N analysis be the best solution?

A) You want to rank the top three sales representatives who have sold the maximum number of products.
B) You want to identify the most senior employee in the company.
C) You want to identify the person who makes the highest salary for all employees.
D) You want to find the manager supervising the largest number of employees.

5. The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(4)
ENAME VARCHAR2 (25)
JOB_ID VARCHAR2(10)
Which SQL statement will return the ENAME, length of the ENAME, and the numeric position of the letter "a" in the ENAME column, for those employees whose ENAME ends with a the letter "n"?

A) SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, 'a') FROM EMPLOYEES WHERE SUBSTR(ENAME, -1, 1) = 'n';
B) SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR(ENAME, -1, 1) = 'n';
C) SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR(ENAME, 1, 1) = 'n';
D) SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, ,-1,1) FROM EMPLOYEES WHERE SUBSTR(ENAME, -1, 1) = 'n';

問題與答案：