This type of injection attack does not show any error message. It is difficult to exploit as it returns information when the application is given SQL payloads that elicit a true or false response…

Time-based SQL injection also lacks error messages but works by injecting time-delay functions (like SLEEP()) and measuring response latency, rather than observing true/false response differences.

Union SQL injection uses the UNION operator to append additional SELECT queries and return data directly in the response, which requires visible output and is not blind.

Error-based SQL injection deliberately triggers database error messages to extract information, which is the opposite of the no-error-message scenario described.

Blind SQL injection does not rely on visible error messages or direct data output. Instead, the attacker crafts boolean-based payloads and infers sensitive data by observing differences in the application's response (true vs. false conditions). This makes it harder to exploit than error-based or union-based techniques but still allows full data extraction through repeated queries.