What are the advantages and disadvantages of using the WHERE clause in SQL queries?

Advantages of the WHERE operator:

• Allows filtering data, returning only the necessary records, which reduces the volume of data transmitted and processed.
• Improves query performance when used with indexes correctly.
• Makes queries more readable and understandable.

Disadvantages:

• If the conditions in WHERE are not optimized or do not use indexes, the query may run slowly.
• Complex conditions can lead to errors or make code maintenance difficult.

Example:

SELECT * FROM users WHERE age > 18;

This query will return only users older than 18, which is more efficient than selecting all and filtering in the application.