PostgreSQL Update Table: Change the value of more than one column with user defined content

3. Write a SQL statement to change the email and commission_pct column of the employees table with 'not available' and 0.10 for those employees whose department_id is 110.

Sample table: employees

Sample Solution:

Code:

-- This SQL statement updates the 'email' and 'commission_pct' columns in the 'employees' table
-- for employees belonging to the department with department_id=110.
-- It sets the 'email' column to 'not available' and the 'commission_pct' column to 0.10 for matching rows.

UPDATE employees 
SET email='not available', commission_pct=0.10 
WHERE department_id=110;

Explanation:

• The UPDATE statement is used to modify existing records in a table.
• employees is the name of the table being updated.
• SET email='not available', commission_pct=0.10 specifies that the value of the 'email' column should be set to 'not available', and the value of the 'commission_pct' column should be set to 0.10 for the rows that meet the specified condition.
• WHERE department_id=110 restricts the update operation to only those rows where the value of the 'department_id' column is 110. This ensures that only employees belonging to the department with department_id=110 will have their email addresses updated to 'not available' and their commission percentage set to 0.10.

Output:

See the result. Only two rows have been updated.

postgres=# SELECT *
postgres-# FROM employees
postgres-# WHERE department_id=110
postgres-# AND  email='not available';
 employee_id | first_name | last_name |     email     | phone_number | hire_date  |   job_id   |  salary  | commission_pct | manager_id | department_id
-------------+------------+-----------+---------------+--------------+------------+------------+----------+----------------+------------+---------------
         205 | Shelley    | Higgins   | not available | 515.123.8080 | 1987-09-30 | AC_MGR     | 12000.00 |           0.10 |        101 |           110
         206 | William    | Gietz     | not available | 515.123.8181 | 1987-10-01 | AC_ACCOUNT |  8300.00 |           0.10 |        205 |           110
(2 rows)

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