How to use WHERE Clause In SQL
Another approach to conditional summation in MySQL is to the use the `WHERE` clause to filter rows before performing the summation. This approach is suitable when you want to the include only certain rows in the summation based on the specific conditions.
Syntax:
SELECT SUM(column_name) AS sum_column
FROM table_name
WHERE condition;
Example
Continuing with the previous example let’s calculate the total quantity sold for the specific product using WHERE clause.
SELECT SUM(quantity_sold) AS total_quantity_sold
FROM sales
WHERE product_id = 1;
Output:
Explanation: In this example, the WHERE clause filters rows where the product_id equals 1 before summing up the quantity_sold effectively achieving the conditional summation.
Conditional Summation
Users can determine the total of the values in a column depending on certain conditions by using MySQL’s Conditional Summation feature. By enabling users to do calculations on data subsets that satisfy particular needs this feature improves data analysis and manipulating capabilities. One’s capacity for data analysis and decision-making may be greatly improved by knowing how to use conditional summation.