Asked by xsjyBldb
555*if(now()=sysdate(),sleep(0),0)
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Answered by
GPT-5 mini
AI
This is a MySQL expression. Breakdown:
- now() returns the current statement timestamp (constant for the statement).
- sysdate() returns the actual current time at the moment the function is evaluated (can differ from now()).
- IF(cond, a, b) returns a if cond is true, otherwise b.
- SLEEP(n) pauses for n seconds and returns 0 (SLEEP(0) does not pause).
So IF(now() = sysdate(), SLEEP(0), 0) will return either the result of SLEEP(0) (which is 0) if the two timestamps compare equal, or 0 otherwise. Multiplying by 555 gives 555 * 0 = 0 in either case — the whole expression evaluates to 0.
(For context: similar patterns with SLEEP(x>0) are sometimes used in time-based SQL-injection tests; here SLEEP(0) causes no delay.)
- now() returns the current statement timestamp (constant for the statement).
- sysdate() returns the actual current time at the moment the function is evaluated (can differ from now()).
- IF(cond, a, b) returns a if cond is true, otherwise b.
- SLEEP(n) pauses for n seconds and returns 0 (SLEEP(0) does not pause).
So IF(now() = sysdate(), SLEEP(0), 0) will return either the result of SLEEP(0) (which is 0) if the two timestamps compare equal, or 0 otherwise. Multiplying by 555 gives 555 * 0 = 0 in either case — the whole expression evaluates to 0.
(For context: similar patterns with SLEEP(x>0) are sometimes used in time-based SQL-injection tests; here SLEEP(0) causes no delay.)
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