SQL Operators

What are the different types of operators used in SQL, and how are they used?

SQL operators are symbols that perform operations on data. They are crucial for filtering, sorting, and manipulating data within SQL queries. Understanding various operators like arithmetic, comparison, and logical operators is essential for writing effective and efficient SQL queries.

Description

-- Example table
CREATE TABLE Products (
    product_id INT PRIMARY KEY,
    price DECIMAL(10, 2)
);

INSERT INTO Products (product_id, price) VALUES
(1, 10.99),
(2, 25.50),
(3, 5.00),
(4, 12.75),
(5, 30.00);

-- Query to find products whose price has a remainder of 0 when divided by 5
SELECT product_id, price
FROM Products
WHERE price % 5 = 0;

Common Mistakes

• Incorrect use of operator precedence (e.g., performing arithmetic operations before comparisons).
• Using the wrong comparison operator (e.g., using = instead of <>).
• Forgetting to use parentheses for complex logical expressions.
• Misunderstanding the behavior of NULL values in comparisons.