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sql injection "union select null" - CodeProject

www.codeproject.com

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

stackoverflow.com

SELECT concat_ws('-', Firstname, Middlename, Surname) AS example_column FROM example_table.

oracle - What is the difference between select count(*) and select...

dba.stackexchange.com

COUNT(*) will include NULLS. COUNT(column_or_expression) won't. This means COUNT(any_non_null_column) will give the same as COUNT(*) of course because there are no NULL values to cause differences. Generally, COUNT(*) should be better because any index can be used...

SQL COUNT « Язык запросов SQL

sql-language.ru

Синтаксис функции COUNT: SELECT COUNT(expression) FROM table WHERE predicates; Функция COUNT принимает один из нескольких параметров

Ask TOM "Getting multiple counts with a union"

asktom.oracle.com

select (select count(*) from tablea)+(select count(*) from tableb) from dual. Not saying it's better (I can't test it right now so it might not even work!)

Шпаргалка по SQL инъекциям | DefconRU

defcon.ru

(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько способов не использовать кавычки в запросе, например с помощью CHAR() (MS) и CONCAT() (M). Синтаксис: SELECT 0x457578 (M). В MySQL есть простой способ представления строки в...

COUNT(*) / Хабр

habr.com

SELECT COUNT(*) FROM Sales.SalesOrderDetail SELECT COUNT_BIG(*) FROM

COUNT (Transact-SQL) - SQL Server | Microsoft Docs

docs.microsoft.com

Сюда входят значения NULL и повторяющиеся значения.This includes NULL values and duplicates.

25 примеров команды SELECT в MySQL | ИТ Блог.

andreyex.ru

Вы можете использовать функцию CONCAT в команде SELECT

SQL SELECT DISTINCT Statement

www.w3schools.com

SELECT DISTINCT Examples. The following SQL statement selects only the DISTINCT values from the "Country" column in the "Customers" table

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