PostgreSQL – Equal(=) Operator
The equal operator (=) is a comparison operator used to check if two values are equal. It’s widely used in various contexts, including WHERE clauses to filter rows based on equality conditions and in joins to combine rows with matching values.
The syntax for using the equals operator is as follows:
SELECT columns FROM table_name WHERE column_name = value;Here’s an example of using the equals operator:
SELECT product_name, price FROM products WHERE category = 'Electronics';In this example, the query retrieves the product name and price for products that belong to the ‘Electronics’ category.
You can use the equals operator to compare various types of values, including numbers, strings, dates, and more. For example:
SELECT employee_name, salary FROM employees WHERE department = 'HR' AND salary = 50000;In this example, the query retrieves the employee name and salary for employees in the ‘HR’ department with a salary of $50,000.
The equals operator is fundamental for making comparisons and is crucial for constructing accurate and meaningful SQL queries. It allows you to filter and retrieve data based on equality conditions, enabling you to find specific information within your database.