How to find the sum of each department using the sum function in Oracle

The SUM function in Oracle can be used to calculate the sum of a set of numbers. To calculate the sum of each department, you need to: Determine the column to be summarized, usually a numeric or decimal type (such as total sales or order quantity) ; Use the GROUP BY clause to group data by department; use the SUM function in the SELECT statement to summarize the values ​​of the columns in each group.

How to use the SUM function in Oracle to calculate the sum of each department

The SUM function in Oracle can be used to calculate a sum The sum of the group of numbers. To calculate the sum of departments, follow these steps:

1. Determine the column to be summarized

This is usually a column of numeric or decimal data type, for example Total sales or order quantity.

2. Group data

Use the GROUP BY clause to group data by department. This will create a group containing all rows for the same department.

3. Use the SUM function

In the SELECT statement, use the SUM function to summarize the values ​​of the columns in each group.

Example query:

<code class="sql">SELECT
  department_id,
  SUM(sales_amount) AS total_sales
FROM
  sales
GROUP BY
  department_id;</code>

Result:

This query will return a table containing the department_id for each department and the total sales of the department (total_sales).

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