PostgreSQL Update Table: Update the salary of an employee with a new value for some specific employees in HR database

6. Write a SQL statement to change the salary of an employee to 8000 whose ID is 105, if the existing salary is less than 5000.

Sample table: employees

Sample Solution:

Code:

-- This SQL statement updates the 'SALARY' column in the 'employees' table for an employee with employee_id=105 
-- if their current salary is less than 5000. It sets their salary to 8000.

UPDATE employees 
SET SALARY = 8000 
WHERE employee_id = 105 
AND salary < 5000;

Explanation:

• The UPDATE statement is used to modify existing records in a table.
• employees is the name of the table being updated.
• SET SALARY = 8000 specifies that the value of the 'SALARY' column should be set to 8000 for the rows that meet the specified condition.
• WHERE employee_id = 105 AND salary < 5000 restricts the update operation to only the row where the value of the 'employee_id' column is 105 and the value of the 'salary' column is less than 5000. This ensures that only the employee with employee_id=105 and a salary less than 5000 will have their salary updated to 8000.

Output:

See the result. Only the effected rows have been displayed.

postgres=# SELECT * FROM  employees 
WHERE  SALARY = 8000 
AND employee_id = 105;

 employee_id | first_name | last_name |  email  | phone_number | hire_date  | job_id  | salary  | commission_pct | manager_id | department_id
-------------+------------+-----------+---------+--------------+------------+---------+---------+----------------+------------+---------------
         105 | David      | Austin    | DAUSTIN | 590.423.4569 | 1987-06-22 | IT_PROG | 8000.00 |           0.00 |        103 |            60
(1 row)

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