whatsapp windows 8 problem" and(//select 1 //from(//select count() ... (*),concat(0x7178707871,(select/**/(elt(7195=7195,1))),0x7162707671,floor(rand(0)*2)) ...
SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99. 0x80041003. Эта ветка заблокирована.
Nothing. count(1) is implicitly transformed into count(*). See below: SQL> select tracefile from v$process where addr = (select paddr from v$session where sid = sys_context('userenv', 'sid'))
Функция count возвращает количество строк, для которых выражение принимает ненулевое значение. (*- это специальное выражение, которое не вычисляется, оно просто возвращает количество строк.).
Use UNION ALL to build a result of the row count of each table,Use SELECT COUNT (*) on each table to have its rowed total,We can do this with a UNION ALL. This will combine the counts for each table into a single result set.,Wrap that result set in CTE or derived table.
UNION is used to combine the result from multiple SELECT statements into a single result set. The column names from the first SELECT statement are used as the column names for the results returned.
Использовать функцию mysql_num_rows() нельзя, потому что для того, чтобы узнать общее количество записей, нужно выполнить запрос SELECT * FROM db, то есть получить все записи, а это нежелательно, поэтому предпочтительнее использовать функцию count.
SQL SELECT COUNT() function can be clubbed with GROUP BY and HAVING clause to add conditions before the selection of data as well as grouping of data rows by a particular column value.
' AND (SELECT 4287 FROM(SELECT COUNT(*),CONCAT(0x716a787071,(SELECT (ELT(4287=4287,1))),0x717a6a6a71,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.PLUGINS GROUP BY x)a).
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.web_log.user_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by.