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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