1' UNION SELECT @--+ #The used SELECT statements have a different number of columns 1' UNION SELECT
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
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 works can somebody help me...
Пример: SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members Это позволит объединить результаты из таблиц news
...All select null, null, null, null, null, null, null, null, null, null, concat
select number, text from test_table union select number, text from test_table_2. Как Вы видите, вывелось всего 5 строк, так как у нас первая строка в первом запросе и первая строка во втором запросе одинаковые, поэтому они объединились. Теперь давайте объединим через union all.
returns non null values in group */ SELECT COUNT(Col1) FROM ##TestData; Because of this, COUNT, DISTINCT, and NULLs have a special relationship with each other that isn’t always as intuitive as many people think. Whenever using COUNT or DISTINCT, make sure to test with NULLs to make...
SELECT ProductName, UnitPrice * (UnitsInStock + UnitsOnOrder) FROM Products; In the example above, if any of the "UnitsOnOrder" values are NULL, the result will be NULL.
SELECT SUM(1) FROM Sales.SalesOrderDetail. Такой вариант примерно равнозначен COUNT. Мы также получим лишний Compute Scalar на
UNION SELECT CONCAT(user, 0x3A, password) FROM mysql.user WHERE user = 'root'.