AND(SELECT COUNT(*) FROM (SELECT 1 UNION SELECT null UNION SELECT !1)x GROUP BY CONCAT
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it...
Пример: SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members Это позволит объединить
Try again: with cte as ( Select 'Luke' as FirstName, 'Jedi' as MiddleName, 'Master' as lastName from dual UNion all Select
...NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT%28version(),0x3a
UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a query that has the same number
SELECT FirstName, COUNT(*) FROM Person.Person GROUP BY FirstName. Посмотрел на план запроса и увидел там явно неадекватное значение Estimated number of rows: Заглянул в статистику по кластерному индексу
· Using SELECT COUNT(*) or SELECT COUNT(1) (which is what I prefer to use) will return the total of all records returned in the result set regardless of NULL values.
Параметр функции COUNT-это выражение, которое должно быть вычислено для каждой строки. Функция count возвращает количество строк, для которых выражение принимает ненулевое значение. (*- это специальное выражение, которое не вычисляется, оно просто возвращает...
select count(*) from any_table. is easily readable and obvious what you are trying to do, and.