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'.
Select count(*) from (. Select top(1) sk.Username from SurrogateKeys as sk. Inner join SurrogateKeyRelatives as skr on sk.Id = skr.SurrKeyId. Where. Sk.Username='John.Doe' and skr.SomeField = 1 ) Q1.
...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).
INFORMATION_SCHEMA.PLUGINS GROUP BY x)a).
...CoNCat((SeLECT+(SELECT+CoNCat(CaST(VERSIoN()+aS+ChaR),0x7e,0x496873616E53656e63616e))+.
Синтаксис: 0xHEX_ЧИСЛО (SM): SELECT CHAR(0x66) (S) SELECT 0x5045 (это не число, а строка) (M) SELECT 0x50 + 0x45 (теперь это число) (M)
SELECT is used to retrieve rows selected from one or more tables, and can include UNION
concat(0x7e,0x27,count(table_name),0x27,0x7e) FROM `information_schema`.tables WHERE.
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.
SELECT is used to retrieve rows selected from one or more tables, and can include UNION statements and subqueries.