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SQL using If Not Null on a Concatenation - Stack Overflow

stackoverflow.com

As @Prdp noted, the answer is RDBMS-specific. What is specific is whether the server treats a zero-length string as being equivalent to NULL, which determines whether concatenating a NULL yields a NULL or not.

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 - COUNT(*) Includes Null Values? - Stack Overflow

stackoverflow.com

1 1 1 NULL NULL NULL 2 2 NULL 1 3 1. Then. SELECT COUNT(*), COUNT(Field1), COUNT(Field2), COUNT(DISTINCT Field3) FROM Table1. Output Is: COUNT(*) = 4; -- count all rows, even null/duplicates --.

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

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

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

docs.microsoft.com

Сюда входят значения NULL и повторяющиеся

COUNT(*) / Хабр

habr.com

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

25 примеров команды SELECT в MySQL | ИТ Блог.

andreyex.ru

Основное использование команды SELECT является просмотр строк из таблицы. Ниже приведен пример команды SELECT, где будет отображать все

SQL SELECT DISTINCT Statement

www.w3schools.com

The SELECT DISTINCT statement is used to return only distinct (different) values.

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