MySQL Multiplication Operator

MySQL Multiplication Operator

The MySQL * operator is used to multiply two or more numbers or expressions. This operator is essential for performing arithmetic calculations in SQL queries.

Syntax

SELECT column1 * column2 AS result
FROM table_name;

The * operator has the following components:

  • column1: The first column or value to be multiplied.
  • column2: The second column or value to be multiplied.
  • result: An alias for the resulting value.
  • table_name: The name of the table from which to retrieve the data.

Example MySQL Multiplication Operator

Let's look at some examples of the MySQL * operator:

Step 1: Using the Database

USE mydatabase;

This query sets the context to the database named mydatabase.

MySQL USE DATABASE

Step 2: Creating a Table

Create a table to work with:

CREATE TABLE sales (
    id INT AUTO_INCREMENT PRIMARY KEY,
    quantity INT NOT NULL,
    price_per_unit DECIMAL(10, 2) NOT NULL
);

This query creates a table named sales with columns for id, quantity, and price_per_unit.

MySQL CREATE TABLE

Step 3: Inserting Initial Rows

Insert some initial rows into the table:

INSERT INTO sales (quantity, price_per_unit)
VALUES (10, 5.00),
       (20, 7.50),
       (15, 6.00);

This query inserts three rows into the sales table.

MySQL INSERT INTO TABLE

Step 4: Multiplying Two Columns

Multiply two columns and display the result:

SELECT quantity * price_per_unit AS total_sales
FROM sales;

This query multiplies the quantity and price_per_unit columns and displays the result as total_sales.

MySQL MULTIPLY TWO COLUMNS

Step 5: Multiplying a Column and a Constant

Multiply a column and a constant value:

SELECT quantity * 2 AS double_quantity
FROM sales;

This query multiplies the quantity column by a constant value of 2, displaying the result as double_quantity.

MySQL MULTIPLY COLUMN AND CONSTANT

Step 6: Multiplying Multiple Columns

Multiply multiple columns and display the result:

SELECT quantity * price_per_unit * 1.05 AS total_sales_with_tax
FROM sales;

This query multiplies the quantity and price_per_unit columns and a constant value of 1.05 (representing a 5% tax), displaying the result as total_sales_with_tax.

MySQL MULTIPLY MULTIPLE COLUMNS

Conclusion

The MySQL * operator is a powerful tool for performing arithmetic calculations in SQL queries. Understanding how to use the * operator is essential for effective data manipulation and analysis in MySQL.