PostgreSQL Restricting and Sorting Data: Display the employees who work in the department 30 or 100 and arrange the result in ascending order on the department ID
2. Write a query to display the name, including first_name and last_name, and department ID who works in the department 30 or 100 and arrange the result in ascending order according to the department ID.
Sample Solution:
Code:
SELECT first_name, last_name, department_id
FROM employees
WHERE department_id IN (30, 100)
ORDER BY department_id ASC;
Sample table: employees
+-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+ | EMPLOYEE_ID | FIRST_NAME | LAST_NAME | EMAIL | PHONE_NUMBER | HIRE_DATE | JOB_ID | SALARY | COMMISSION_PCT | MANAGER_ID | DEPARTMENT_ID | +-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+ | 100 | Steven | King | SKING | 515.123.4567 | 1987-06-17 | AD_PRES | 24000.00 | 0.00 | 0 | 90 | | 101 | Neena | Kochhar | NKOCHHAR | 515.123.4568 | 1987-06-18 | AD_VP | 17000.00 | 0.00 | 100 | 90 | | 102 | Lex | De Haan | LDEHAAN | 515.123.4569 | 1987-06-19 | AD_VP | 17000.00 | 0.00 | 100 | 90 | | 103 | Alexander | Hunold | AHUNOLD | 590.423.4567 | 1987-06-20 | IT_PROG | 9000.00 | 0.00 | 102 | 60 | | 104 | Bruce | Ernst | BERNST | 590.423.4568 | 1987-06-21 | IT_PROG | 6000.00 | 0.00 | 103 | 60 | | 105 | David | Austin | DAUSTIN | 590.423.4569 | 1987-06-22 | IT_PROG | 4800.00 | 0.00 | 103 | 60 | | 106 | Valli | Pataballa | VPATABAL | 590.423.4560 | 1987-06-23 | IT_PROG | 4800.00 | 0.00 | 103 | 60 | | 107 | Diana | Lorentz | DLORENTZ | 590.423.5567 | 1987-06-24 | IT_PROG | 4200.00 | 0.00 | 103 | 60 | | 108 | Nancy | Greenberg | NGREENBE | 515.124.4569 | 1987-06-25 | FI_MGR | 12000.00 | 0.00 | 101 | 100 | .......... | 206 | William | Gietz | WGIETZ | 515.123.8181 | 1987-10-01 | AC_ACCOUNT | 8300.00 | 0.00 | 205 | 110 | +-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+
Output:
pg_exercises=# SELECT first_name, last_name, department_id pg_exercises-# FROM employees pg_exercises-# WHERE department_id IN (30, 100) pg_exercises-# ORDER BY department_id ASC; first_name | last_name | department_id -------------+------------+--------------- Karen | Colmenares | 30 Den | Raphaely | 30 Alexander | Khoo | 30 Shelli | Baida | 30 Sigal | Tobias | 30 Guy | Himuro | 30 Nancy | Greenberg | 100 Daniel | Faviet | 100 John | Chen | 100 Ismael | Sciarra | 100 Jose Manuel | Urman | 100 Luis | Popp | 100 (12 rows)
Relational Algebra Expression:
Relational Algebra Tree:
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PREV : Write a query to display the name, including first_name and last_name and salary for all employees whose salary is out of the range between $10,000 and $15,000.
NEXT : Write a query to display the name, including first_name and last_name, and salary who works in the department either 30 or 100 and salary is out of the range between $10,000 and $15,000.
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