SQL SELECT SUM
It is also known as SQL SUM() function. It is used in a SQL query to return summed value of an expression.
Let's see the Syntax for the select sum function:
FROM tables
WHERE conditions;
expression may be numeric field or formula.
This would produce the following result.
| ID | EMPLOYEE_NAME | SALARY |
|---|---|---|
| 1 | JACK REACHER | 32000 |
| 2 | PADMA MAHESHWARI | 22000 |
| 3 | JOE PETRA | 41000 |
| 4 | AMBUJ AGRAWAL | 21000 |
After using this SQL SELECT SUM example, it will produce the result containing the sum of the salary greater than 20000.
Total salary: 116,000
SQL SUM EXAMPLE with single field:
If you want to know how the combined total salary of all employee whose salary is above 20000 per month.
FROM employees
WHERE salary > 20000;
In this example, you will find the expression as "Total Salary" when the result set is returned.
SQL SUM EXAMPLE with SQL DISTINCT:
You can also use SQL DISTINCT clause with SQL SUM function.
FROM employees
WHERE salary > 20000;
SQL SUM EXAMPLE with SQL GROUP BY:
Sometimes there is a need to use the SQL GROUP BY statement with the SQL SUM function.
For example, we could also use the SQL SUM function to return the name of department and the total sales related to department.
FROM order_details
GROUP BY department;
Let us take a table named order_details
| ID | DEPARTMENT | DATE | DAILY SALES |
|---|---|---|---|
| 1 | Mechanical | 2012-08-13 | 360 |
| 2 | Electrical | 2012-08-13 | 100 |
| 2 | Electrical | 2012-08-14 | 110 |
| 3 | Electronics | 2012-08-13 | 150 |
| 3 | Electronics | 2012-08-14 | 170 |
After using the SQL GROUP BY statement with SUM, you will find the following result.
| DEPARTMENT | SUM(DAILY SALES) |
|---|---|
| Mechanical | 360 |
| Electrical | 210 |
| electronics | 320 |
