-1" OR 3*2>5 --

Short answer: It’s a classic SQL injection payload.

What it does conceptually:

• The -1" tries to close a string literal in a SQL query.
• OR 32>5 adds a condition that is always true (since 32 = 6 and 6 > 5).
• The -- starts a comment, so the rest of the original query is ignored.

Evaluation of the math: 3*2 = 6, and 6 > 5 is true.

Effect in a vulnerable query (e.g., WHERE field = "-1" OR 3*2>5 --): the WHERE clause becomes effectively true, so the query may return all rows or bypass a check.

Defensive takeaways (exam/real-world):

• Do not build SQL by concatenating user input. Use parameterized queries or prepared statements.
• Validate and sanitize inputs, and use least-privilege database accounts.
• Use ORM or query builders that separate data from code.
• Consider additional mitigations like input length checks, escaping, and disallowing multiple statements where feasible.
• Be aware that comment syntax varies by SQL dialect (e.g., -- works in many systems, but always ensure proper spacing after --).

If you want, I can show safe, parameterized equivalents in your preferred language.