3. What measures should be taken to ensure the clarity and maintainability of queries involving multiple logical operators?

Use Parentheses: Parentheses can be used to make the order of operations clear in complex queries. They help in defining the precedence of logical operators, making the query easier to read and understand.

Proper Formatting: Proper indentation and formatting of the query can greatly improve its readability. Each subquery, condition, or logical block should be properly indented.

Use of Aliases: Aliases can be used to make the query more readable. They can be particularly useful when dealing with complex subqueries or when the tables have long or complicated names.

Commenting: Comments should be used to explain complex parts of the query. They can be used to describe the purpose of the query, the meaning of complex expressions, or the reason for specific conditions.

Consistent Naming Conventions: Consistent naming conventions should be used for tables and columns. This makes it easier to understand the structure of the query.

Avoid Using Too Many Operators: Too many logical operators can make a query difficult to understand. If possible, try to simplify the query by reducing the number of operators.

Break Down Complex Queries: If a query is too complex, it can be broken down into several simpler queries. This can make the query easier to understand and maintain.

Regular Review and Refactoring: Queries should be regularly reviewed and refactored to ensure they remain clear and maintainable. This can involve removing unnecessary conditions, simplifying complex expressions, or updating the query to reflect changes in the underlying data.