CompTIA PenTest+ Practice Test

In SQL queries, which expression is often used to create a syntactically correct query that always evaluates to true?

1. True Or False

2. 1=1

3. NULL

4. Always True

The correct answer is: 1=1

The expression "1=1" is commonly used in SQL queries to create syntactically correct queries that always evaluate to true. This construct serves multiple purposes in SQL: 1. **Placeholder for Conditional Logic**: When constructing dynamic SQL queries, particularly those that involve conditional logic with WHERE clauses, "1=1" acts as a baseline. It allows additional conditions to be appended easily without needing to manage whether to add an "AND" or "OR". For instance, when building a query incrementally, starting with "WHERE 1=1" allows you to freely add additional conditions using "AND" without worrying about whether it's the first condition. 2. **Simplicity in Query Structure**: Because "1=1" is a straightforward and always true statement, it simplifies the logic in complex queries, ensuring that the primary focus remains on the other conditions being added rather than on the construction of the query itself. 3. **Use in Scripts and Applications**: In various programming scenarios that generate SQL queries dynamically, utilizing "1=1" helps avoid syntax errors. This enables better maintainability and readability of the code, especially when modifying filter criteria. Ultimately, the inclusion of "1=1" helps ensure that the SQL query