Using pg_sleep(0) means zero delay, allowing an attacker to confirm the injection point without causing a noticeable, high-latency alert.
The application may not show direct SQL errors, but a notable delay in response time confirms the vulnerability. MEGA'/**/and(select'1'from/**/pg_sleep(0))::text>'0
Use parameterized queries (prepared statements) in the application code, which separate SQL code from user data, rendering input like ' harmless. Using pg_sleep(0) means zero delay, allowing an attacker
Similar to the PortSwigger Blind SQL Injection lab examples, this structure is used to ask the database boolean questions (e.g., "Does the database name start with 'a'?"). If the page delays, the answer is yes; if it loads immediately, the answer is no. Detection and Mitigation Using pg_sleep(0) means zero delay