Logical operators are used to combine multiple conditions in SQL SELECT statements. They allow you to filter and retrieve data based on multiple criteria. In this blog post, we will explore the commonly used logical operators in SQL SELECT statements.

AND Operator

The AND operator is used to combine two or more conditions in a SQL SELECT statement. It retrieves rows that satisfy all of the specified conditions. Here’s an example:

SELECT * FROM employees
WHERE age > 30 AND salary > 50000;

This query selects all rows from the employees table where the age is greater than 30 and the salary is greater than 50000.

OR Operator

The OR operator is used to combine two or more conditions in a SQL SELECT statement. It retrieves rows that satisfy any of the specified conditions. Here’s an example:

SELECT * FROM employees
WHERE department = 'HR' OR department = 'Finance';

This query selects all rows from the employees table where the department is either ‘HR’ or ‘Finance’.

NOT Operator

The NOT operator is used to negate a condition in a SQL SELECT statement. It retrieves rows that do not satisfy the specified condition. Here’s an example:

SELECT * FROM employees
WHERE NOT department = 'IT';

This query selects all rows from the employees table where the department is not ‘IT’.

Combining Operators

You can combine logical operators to create more complex conditions in SQL SELECT statements. For example:

SELECT * FROM products
WHERE (price > 100 AND stock > 0) OR (category = 'Electronics' AND discount > 0.1);

This query selects all rows from the products table where the price is greater than 100 and the stock is greater than 0, or the category is ‘Electronics’ and the discount is greater than 0.1.

By understanding and utilizing these logical operators effectively, you can construct powerful SQL SELECT statements to retrieve precisely the data you need.

#SQL #SELECT