PostgreSQL Aggregate Functions and Group By: Get the total salaries payable to employees

2. Write a query to get the total salaries payable to employees.

Sample Solution:

Code:

-- Calculate the total sum of salaries for all employees in the database
SELECT SUM(salary) 
FROM employees;

Explanation:

• This SQL query is designed to retrieve the sum of salaries for all employees stored in the database.
• The SUM() function is an aggregate function in SQL that calculates the sum of values in a column.
• salary is presumably a column in the employees table that holds the salary information for each employee.
• The query calculates the sum of all values in the salary column for all rows in the employees table.
• The result will be a single value representing the total sum of all salaries in the table.

Sample table: employees

Output:

pg_exercises=# SELECT SUM(salary)
pg_exercises-# FROM employees;
    sum
-----------
 691400.00
(1 row)

Relational Algebra Expression:

Relational Algebra Tree:

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