Write a query in SQL to list the department where there are no employees

برمجة سي كيو ال sql

2021-09-07
mhanasmh00489829403

Write a query in SQL to list the department where there are no employees.

Sample table: employees

emp_id | emp_name | job_name  | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+-----------+------------+------------+---------+------------+--------
  68319 | KAYLING  | PRESIDENT |            | 1991-11-18 | 6000.00 |            |   1001
  66928 | BLAZE    | MANAGER   |      68319 | 1991-05-01 | 2750.00 |            |   3001
  67832 | CLARE    | MANAGER   |      68319 | 1991-06-09 | 2550.00 |            |   1001
  65646 | JONAS    | MANAGER   |      68319 | 1991-04-02 | 2957.00 |            |   2001
  67858 | SCARLET  | ANALYST   |      65646 | 1997-04-19 | 3100.00 |            |   2001
  69062 | FRANK    | ANALYST   |      65646 | 1991-12-03 | 3100.00 |            |   2001
  63679 | SANDRINE | CLERK     |      69062 | 1990-12-18 |  900.00 |            |   2001
  64989 | ADELYN   | SALESMAN  |      66928 | 1991-02-20 | 1700.00 |     400.00 |   3001
  65271 | WADE     | SALESMAN  |      66928 | 1991-02-22 | 1350.00 |     600.00 |   3001
  66564 | MADDEN   | SALESMAN  |      66928 | 1991-09-28 | 1350.00 |    1500.00 |   3001
  68454 | TUCKER   | SALESMAN  |      66928 | 1991-09-08 | 1600.00 |       0.00 |   3001
  68736 | ADNRES   | CLERK     |      67858 | 1997-05-23 | 1200.00 |            |   2001
  69000 | JULIUS   | CLERK     |      66928 | 1991-12-03 | 1050.00 |            |   3001
  69324 | MARKER   | CLERK     |      67832 | 1992-01-23 | 1400.00 |            |   1001
(14 rows)

 dep_id |  dep_name  | dep_location
--------+------------+--------------
   1001 | FINANCE    | SYDNEY
   2001 | AUDIT      | MELBOURNE
   3001 | MARKETING  | PERTH
   4001 | PRODUCTION | BRISBANE
(4 rows)

الأجوبة

SELECT b.dep_id,
       count(a.dep_id)
FROM department b
LEFT OUTER JOIN employees a ON a.dep_id=b.dep_id
GROUP BY b.dep_id
HAVING count(a.dep_id) = 0;

Sample Output:

 dep_id | count
--------+-------
   4001 |     0
(1 row)

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أسئلة مشابهة

Write a query in SQL to list the employees in department PRODUCTION or AUDIT who joined after 1991 and they are not MARKER or ADELYN to their name

Write a query in SQL to list the employees of grade 3 and 4 working in the department of FINANCE or AUDIT and whose salary is more than the salary of ADELYN

Write a query in SQL to display the employee ID, name, salary, department name, location, department ID, job name of all the employees working at SYDNEY or working in the FINANCE deparment with an annual salary above 28000

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