sql injection "union select null" - CodeProject
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...
SQL using If Not Null on a Concatenation - Stack Overflow
Middlename is NULL and OP probably uses Oracle. Although Oracle treats zero-length character strings as nulls, concatenating a zero-length character string with another operand always results in the other operand, so null can result only from the concatenation of two null strings.
Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow
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
Шпаргалка по SQL инъекциям | DefconRU
Пример: SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members Это позволит объединить результаты из таблиц news
SQL ISNULL(), NVL(), IFNULL() and COALESCE() Functions
Look at the following SELECT statement: SELECT ProductName, UnitPrice * (UnitsInStock + UnitsOnOrder) FROM Products
COUNT, DISTINCT, and NULLs - SQL with Bert
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...
Counting NULLs | SQL Studies
How do NULL values affect the COUNT function? Here are three different ways to COUNT: Count the…
COUNT(*) / Хабр
SELECT SUM(1) FROM Sales.SalesOrderDetail. Такой вариант примерно равнозначен COUNT. Мы также получим лишний Compute Scalar на плане выполнения: [Expr1003] = Scalar Operator(CASE WHEN [Expr1004]=(0) THEN NULL ELSE [Expr1005] END).
Внедрение SQL-кода — Википедия
-1 UNION SELECT group_concat(username, 0x3a, password) FROM admin.
SQL COUNT « Язык запросов SQL
Синтаксис функции COUNT: SELECT COUNT(expression) FROM table WHERE predicates; Функция COUNT принимает один из нескольких параметров