Examine the description of the STUDENTS table: https://assets.asklib.com/images/image2/2018080115032850512.jpg Which two aggregate functions are valid on the START_DATE column?（）

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• Examine the description of the EMPLOYEES table: EMP_ID NUMBER(4) NOT NULL LAST_NAME VARCHAR2(30) NOT NULL FIRST_NAME VARCHAR2(30) DEPT_ID NUMBER(2) Which statement produces the number of different departments that have employees with last name Smith? （）

  A . SELECT COUNT (*) FROM employees WHERE last _name='smith'; B . SELECT COUNT (dept_id) FROM employees WHERE last _name='smith'; C . SELECT DISTINCT (COUNT (dept_id) FROM employees WHERE last _name='smith'; D . SELECT COUNT (DISTINCT dept_id) FROM employees WHERE last _name='smith'; E . SELECT UNIQE (dept_id) FROM employees WHERE last _name='smith'

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• Examine the description of the EMPLOYEES table: EMP_ID NUMBER(4) NOT NULL LAST_NAME VARCHAR2(30) NOT NULL FIRST_NAME VARCHAR2(30) DEPT_ID NUMBER(2) Which statement produces the number of different departments that have employees with last name Smith?（）

  A . SELECT COUNT(*) FROM employees WHERE last_name='Smith'; B . SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith'; C . SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith'; D . SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith'; E . SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith'

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  A . Sea water is heated to boiling temperature while under a vacuum B . Sea water is passed over heated plates in a thin film C . Heated sea water is injected into a vacuum chamber D . Sea water is forced through a heated eductor

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• Examine the description of the STUDENTS table: STD_ID NUMBER(4) COURSE_ID VARCHARD2(10) START_DATE DATE END_DATE DATE Which two aggregate functions are valid on the START_DATE column?（）

  A . SUM(start_date) B . AVG(start_date) C . COUNT(start_date) D . AVG(start_date, end_date) E . MIN(start_date) F . MAXIMUM(start_date)

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• Examine the description of the EMPLOYEES table: https://assets.asklib.com/images/image2/2018080110341576486.jpg Which statement produces the number of different departments that have employees with last name Smith?（）

  A . SELECT COUNT(*) FROM employees WHERE last_name='Smith'; B . SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith'; C . SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith'; D . SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith'; E . SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith'

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• Examine the description of the EMPLOYEES table: https://assets.asklib.com/images/image2/2018080114592471196.jpg Which statement shows the maximum salary paid in each job category of each department?（）

  A . SELECT dept_id, job_cat, MAX(salary) FROM employees WHERE salary > MAX(salary); B . SELECT dept_id, job_cat, MAX(salary) FROM employees GROUP BY dept_id, job_cat; C . SELECT dept_id, job_cat, MAX(salary) FROM employees; D . SELECT dept_id, job_cat, MAX(salary) FROM employees GROUP BY dept_id; E . SELECT dept_id, job_cat, MAX(salary) FROM employees GROUP BY dept_id, job_cat, salary

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• Which three of the following descriptions are true about the firewall modes？ （）

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• Examine the description of the MARKS table:SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.Examine this SELECT statement based on the MARKS table:What is the result of the SELECT statement？（）

  <img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/1179420481e271350f195c64f9e527b9.jpg' /> <img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/a88968eec9764c2a8638e3aee2b1e23d.jpg' /> A. The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject. B. The statement returns an error at the SELECT clause. C. The statement returns an error at the WHERE clause. D. The statement returns an error at the ORDER BY clause.

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• Which one is correct of the following descriptions about the transport mechanism of macromolecular substances（）

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• Examine the description of the STUDENTS table:STD_ID NUMBER（4)COURSE_ID VARCHAR2（10)START_DATE DATEEND_DATE DATEWhich two aggregate functions are valid on the START_DATE column？ （）

  A．SUM(start_date) B．AVG(start_date) C．COUNT(start_date) D．AVG(start_date, end_date) E．MIN(start_date) F．MAXIMUM(start_date)

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