-1" OR 5*5=26 --

Looks like a fragment that resembles an SQL injection payload. Here’s a safe, exam-oriented breakdown:

• 55=26 evaluates to false, since 55 is 25.
• The part -- in many SQL dialects starts a comment, so anything after it is ignored.
• The -1" at the start isn’t a valid boolean part in standard SQL (it looks like an attempt to close a string literal), so on its own it’s not meaningful in a well-formed query. In practice, this would often cause a syntax error rather than succeed.

In short:

• As a pure boolean expression, it doesn’t yield a meaningful true result.
• In the context of SQL injection, the payload relies on closing a string literal, injecting OR conditions, and commenting out the rest. This particular fragment is not a standard or reliable payload (double quotes are not the usual way to terminate a string in SQL, which typically uses single quotes).

If you’re studying for an exam, useful related topics include:

• How SQL injections work conceptually (closing literals, injecting OR conditions, using comments).
• How to defend against them: parameterized queries/prepared statements, input validation, least-privilege accounts, and avoiding dynamic SQL.
• Common safe examples to illustrate true/false logic in SQL (e.g., SELECT with WHERE clauses) without attempting exploitation.

Would you like a brief, exam-style example of how to defend against SQL injection or a pure, safe explanation of boolean logic in SQL?